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AXIOMTEK IMB700, User Manual

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IMB700 LGA4189 ATX Motherboard 

18 

 

Board and Pin Assignments

 

 
2.5.13 

Fan Connectors (FAN1~FAN3 and FAN5~6) 

This motherboard has five fan connectors. Find fan speed option(s) at BIOS Setup Utility: 
Advanced\HW Monitor\PC Health Status. 
 
FAN1~3 and FAN6 (4x1-pin p=2.54mm) is for the the system fan connectors. 
FAN 5 (4x1-pin p=2.54mm) is for the the CPU fan connector. 
 

 

 

 
 

 

 

2.5.14 

Internal USB Headers (USB1~4) 

USB 2~4 are 5x2-pin p=2.54mm headers for USB 2.0 interface. 
 

 

 

 
 

USB 1 is a Type-A 180D connector for USB2.0 signal. 
 

 

 

 
 
 
 
 

 

Pin 

Signal 

1 

GND 

2 

+12V 

3 

FAN Speed Detection 

4 

FAN Speed Control 

Pin  Signal 

Pin  Signal 

1 

+5 V_DUAL 

2 

+5 V_DUAL 

3 

USB 5, 7, 12- 

4 

USB 6, 8, 13- 

5 

USB 5, 7, 12+ 

6 

USB 6, 8, 13+ 

7 

GND 

8 

GND 

 

 

10 

GND 

Pin  Signal 

1 

+5V_DUAL 

2 

USB- 

3 

USB+ 

4 

GND 

Summary of Contents for IMB700

Page 1: ...IMB700 Intel LGA4189 Xeon Scalable Ice Lake SP Processor ATX Industrial Motherboard with 3 PCIe x16 3 PCIe x8 VGA NVMe User s Manual ...

Page 2: ...ation in this manual Axiomtek reserves the right to change or revise this document and or product at any time without notice No part of this document may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of Axiomtek Co Ltd CAUTION Wrong type of batteries may cause expl...

Page 3: ...system unit chassis for a few seconds to discharge static electricity from your body Wear a grounding wrist strap available from most electronic component stores when handling boards and components Trademarks Acknowledgments Axiomtek is a trademark of Axiomtek Co Ltd Intel and Celeron are trademarks of Intel Corporation Windows is a trademark of Microsoft Corporation AMI is a trademark of American...

Page 4: ...ader CN5 12 2 5 4 GPIO Header CN6 13 2 5 5 TPM Pin Header CN11 13 2 5 6 M 2 2280 Key M PCIe x4 SSD slot CN12 14 2 5 7 SMBus Header CN14 14 2 5 8 Voltage Monitor Header CN15 15 2 5 9 Front Panel Header CN16 15 2 5 10 Power Input Connectors ATX1 ATX2 CN18 and CN19 16 2 5 11 Internal USB 3 1 Gen1 Connector CN20 17 2 5 12 COM1 Connector COM1 17 2 5 13 Fan Connectors FAN1 FAN3 and FAN5 6 18 2 5 14 Inte...

Page 5: ...Menu 32 4 5 Platform Configuration 43 4 6 Socket Configuration 48 4 7 Security Menu 51 4 8 Boot Menu 52 4 9 Save Exit Menu 53 Appendix A Watchdog Timer 55 About Watchdog Timer 55 How to Use Watchdog Timer 55 Appendix B TPM Module Installation 57 Appendix C Configuring SATA for RAID 61 Configuring SATA Hard Drive s for RAID Function 61 Appendix D Digital I O 67 Digital I O Software Programming 67 ...

Page 6: ...vi This page is intentionally left blank ...

Page 7: ...deo surveillance To maximize expandibility the Intel Ice Lake SP based IMB700 comes with an internal USB dongle six USB 3 1 Gen1 and seven USB 2 0 one RS 232 422 485 two Gigabit LANs with Intel Ethernet controller I210 AT eight channel programmable digital I O one HD Codec audio connector SMBus plus one PS 2 keyboard and mouse interface It also supports VGA display interface and multiple graphic c...

Page 8: ...USB dongle 1 2 Specifications CPU LGA4189 Socket Intel Xeno Scalable Ice Lake SP processor Chipset Intel C621A BIOS AMI BIOS System Memory C621A 6 x 288 pin DIMM sockets Maximum 384GB DDR4 memory max 64GB per slot Supports 3200MHz Supports the memory with ECC function Onboard Multi I O 1 x PS 2 keyboard and mouse 1 x RS 232 422 485 rear I O BIOS selection USB Interface 6 x USB3 1 Gen1 ports 4 x re...

Page 9: ...15 pin D Sub as VGA connector Resolution max up to 1920x1200 60Hz AST2510 Expansion Interface 3 x PCI Express x16 slots 3 x PCI Express x8 slots Note Default slot 6 has PCIe x16 signal and slot5 has no signal If you want to switch slot 5 and slot 6 signal to PCIe x8 signal please refer to section 2 4 2 Power Input 1 x 24 pinATX power input connector 1 x 12V ATX power input connector 2 x 12V ATX po...

Page 10: ...IMB700 LGA4189 ATX Motherboard 4 Introduction 1 3 Packing list Bulk packing 1 x Motherboard 1 x I O bracket Gift box 1 x Motherboard 1 x I O bracket ...

Page 11: ...IMB700 LGA4189 ATX Motherboard Board and Pin Assignments 5 Section 2 Board and Pin Assignments 2 1 Board Layout Top side ...

Page 12: ...IMB700 LGA4189 ATX Motherboard 6 Board and Pin Assignments 2 2 Rear I O I O side I O bracket ...

Page 13: ...IMB700 LGA4189 ATX Motherboard Board and Pin Assignments 7 2 3 Block Diagram ...

Page 14: ...ry table of all jumpers and onboard default settings Note Turn off power before changing any default jumper settings Jumper Description Setting JP2 System temperature sensor source select Default internal sensor External sensor can be installed on 2 3 1 2 Close JP13 PCIe x16 slot using location slot 5 Default x16 1 2 Close JP19 Clear CMOS Default Normal operation 1 2 Close JP20 AT ATX power mode s...

Page 15: ...al Time Clock RTC RAM in CMOS You can clear the CMOS memory of date time and system setup parameters by erasing the CMOS RTC RAM data The onboard button cell battery powers the RAM data in CMOS which includes system setup information such as system passwords To erase the RTC RAM 1 Turn OFF the computer and unplug the power cord 2 Remove the onboard battery 3 Move the jumper clip from pins 1 2 defa...

Page 16: ...4189 ATX Motherboard 10 Board and Pin Assignments 2 4 4 AT ATX Mode Select JP20 This 3x1 pin p 2 54mm jumper allows you to select AT or ATX power mode Function Setting AT mode Default 1 2 close ATX mode 2 3 close ...

Page 17: ...15 Voltage Monitor Header CN16 Front Panel Header CN18 24 pin ATX Power Input Connector CN20 Internal USB3 1 GEN1 Connector ATX1 ATX 12V Power Input Connector ATX2 CN19 CPU Power Input Connector COM1 COM port Connector FAN1 3 FAN6 System Fan Connectors FAN5 CPU Fan Connector USB1 Internal USB2 0 Type A Connector USB2 Internal USB2 0 Headers USB3 Internal USB2 0 Headers USB4 Internal USB2 0 Headers...

Page 18: ... CN4 connectors on the rear I O are used for installing USB peripherals such as a keyboard mouse scanner etc 2 5 3 External Sensor Header CN5 The external sensor header is an 1x2 pin p 2 54mm header The function of CN5 is to connect an external sensor Pin Signal Pin Signal 1 Red 2 Green 3 Blue 4 NC 5 GND 6 GND 7 GND 8 GND 9 VCC 10 GND 11 NC 12 DDC DATA 13 Horizontal Sync 14 Vertical Sync 15 DDC CL...

Page 19: ... GPI with high level 2 5 5 TPM Pin Header CN11 These are 7x2 pin p 2 0mm headers for SPI interface with an AX93515 TPM module Note The screw type is M2 0 4 Pin Signal Pin Signal 1 DIO1 2 DIO8 3 DIO2 4 DIO7 5 DIO3 6 DIO6 7 DIO4 8 DIO5 9 NC 10 GND Pin Signal Pin Signal 1 VCC3P3 2 GND 3 MOSI 4 MISO 5 CLK 6 CS2 7 RST 8 PIRQ 9 PP 10 NC 11 NC 12 NC 13 NC 14 MC 13 11 9 7 5 3 1 14 12 10 8 6 4 2 ...

Page 20: ...7 GND 28 NC 29 PEX1_RX 30 NC 31 PEX1_RX 32 NC 33 GND 34 NC 35 PEX1_TX 36 NC 37 PEX1_TX 38 M 2_DEVSLP 39 GND 40 NC 41 PEX0_RX 42 NC 43 PEX0_RX 44 NC 45 GND 46 NC 47 PEX0_TX 48 NC 49 PEX0_TX 50 PERST 51 GND 52 CLKREQ 53 PEX0_REFCLKn 54 PEWAKE 55 PEX0_REFCLKp 56 NC 57 GND 58 NC 59 CONNECTOR Key M 60 CONNECTOR Key M 61 CONNECTOR Key M 62 CONNECTOR Key M 63 CONNECTOR Key M 64 CONNECTOR Key M 65 CONNECT...

Page 21: ...s is a front panel header 7x2 pin p 2 54mm Note The buzzer on the motherboard will be active when pin 2 and pin 4 are connected the external speaker on the chassis will be active when pin 2 and pin 4 are open Pin Signal Pin Signal 1 GND 2 GND 3 VCC5_SB 4 3 3V 5 5V 6 5V 7 12V 8 12V Pin Signal 1 Power LED 2 SPK 3 GND 4 BUZZER 5 Power LED 6 N C 7 N C 8 SPK 9 PWR 10 PWR 11 RESET 12 RESET 13 HD LED 14 ...

Page 22: ...pply plug until it completely and firmly fits into the connector Loose connection may cause system instability ATX2 CPU power input connector CN19 CPU power input connector ATX1 ATX 12V power input connector CN18 24 pin ATX power input connector Pin ATX2 Signal Pin ATX2 Signal 1 GND 3 12V 2 GND 4 12V Pin ATX2 Signal Pin ATX2 Signal 1 GND 5 12V 2 GND 6 12V 3 GND 7 12V 4 GND 8 12V Pin ATX2 Signal Pi...

Page 23: ...serial port interface The pin assignments of RS 232 422 485 are listed in the table below Note COM1 can be used for RS 232 422 485 signals through BIOS settings Pin Signal Pin Signal 1 VBUS0 2 SSRX5 19 VBUS1 3 SSRX5 18 SSRX6 4 GND 17 SSRX6 5 SSTX5 16 GND 6 SSTX5 15 SSTX6 7 GND 14 SSTX6 8 USB10 13 GND 9 USB10 12 USB11 10 ID 11 USB11 Pin RS 232 RS 422 RS 485 1 DCD TX 485 2 RXD TX 485 3 TXD RX N C 4 ...

Page 24: ...mm is for the the system fan connectors FAN 5 4x1 pin p 2 54mm is for the the CPU fan connector 2 5 14 Internal USB Headers USB1 4 USB 2 4 are 5x2 pin p 2 54mm headers for USB 2 0 interface USB 1 is a Type A 180D connector for USB2 0 signal Pin Signal 1 GND 2 12V 3 FAN Speed Detection 4 FAN Speed Control Pin Signal Pin Signal 1 5 V_DUAL 2 5 V_DUAL 3 USB 5 7 12 4 USB 6 8 13 5 USB 5 7 12 6 USB 6 8 1...

Page 25: ...rs for the front panel 2x1 pin p 2 54mm JP 3 is for chapter sectio active LED JP 10 is for LAN2 active LED 2 5 17 Programmable LED connectors JP4 JP 4 is for programmable LED connector 2x1 pin p 2 54mm 2 5 18 Keyboard and PS 2 Mouse Connector PS1 The board supports a keyboard and mouse interface Connector CN is a DIN connector for PS 2 keyboard connection via a Y Cable Pin Signal CN 1 Keyboard Dat...

Page 26: ...signments 2 5 19 Intel HD Audio Digital Header HDA1 This is a 2x8 pin header for connecting an external HD Audio board AX93242 Pin Signal Pin Signal 1 BCLK 2 GND 3 RST 4 N C 5 SYNC 6 GND 7 SDO 8 3 3S 9 SDIO 10 12VS 11 N C 12 13 N C 14 N C 15 N C 16 GND ...

Page 27: ...the IMB700 Series 2 6 1 Installing the CPU The LGA4189 processor socket comes with a cover to protect the processor Please install the processor into the CPU socket step by step as illustrated below There are two cooler modules as shown in the following pictures This cooler is for CPU under 205 Watts This cooler is for CPU above 205 Watts ...

Page 28: ...atts Step 1 Remove the socket protective covers Press the load lever and release it from the retention tab There are two levers for each CPU socket Step 2 Insert the CPU onto the CPU clip and align notch A to D on the CPU clip then latch pin 1 to 4 Cover 1 Cover 2 Notch B Notch A Pin 1 Pin 2 Notch C Notch D Pin 3 Pin 3 ...

Page 29: ...oard Board and Pin Assignments 23 Step 3 Check the notch on the CPU and the pin on the CPU socket of IMB700 Follow the installation direction and Install the CPU clip and CPU on the cooler module Load lever Load lever Notch Pin ...

Page 30: ...board and then align pin A to hole A and pin B to hole B simultaneously Note The installation direction of CPU on the clip and cooler module can affect how the air flows through chassis please follow the installing instructions to ensure that the CPU is properly installed for best cooling performance Pin A Pin B Hole A Hole B ...

Page 31: ...IMB700 LGA4189 ATX Motherboard Board and Pin Assignments 25 Step 5 Latch four levers on the cooler Step 6 Use a T30 Torx screwdriver 8in LBF to tighten the screws on the cooler ...

Page 32: ...d Pin Assignments This sequence is for installing the CPU cooler above 205 Watts Repeat step1 to 3 for installing CPU on CPU cooler Step 7 Latch four levers on the cooler Step5 Put the fan module on the CPU cooler and tighten two screws 8in LBF ...

Page 33: ...performance depends on the microprocessor Make sure all correct settings are arranged for your microprocessor to prevent the CPU from damage Note Caution Make sure to turn off power supply before you install the processor into the CPU socket 3 2 BIOS The IMB700 series uses AMI Plug and Play BIOS 3 3 System Memory The IMB700 supports six 288 pin DDR4 RDIMM sockets for maximum memory capacity up to ...

Page 34: ...IMB700 LGA4189 ATX Motherboard 28 Hardware Description This page is intentionally left blank ...

Page 35: ...2 Once you enter the BIOS the main BIOS setup menu displays You can access the other setup screens from the main BIOS setup menu such as the Advanced and Chipset menus Note If your computer cannot boot after making and saving system changes with BIOS setup you can restore BIOS optimal defaults by setting JP8 see section 2 4 1 It is strongly recommended that you should avoid changing the chipset s ...

Page 36: ...allow you to display the setup sub screens Plus Minus The Plus and Minus Arrow keys allow you to change the field value of a particular setup item F1 The F1 key allows you to display the General Help screen F2 The F2 key allows you to Load Previous Values F3 The F3 key allows you to Load Optimized Defaults F4 The F4 key allows you to save any changes you have made and exit Setup Press the F4 key t...

Page 37: ...ribed below The Main BIOS setup screen is shown below BIOS Information Display the BIOS information Access Level Display the access level of current user System Date Time Use this option to change the system time and date Highlight System Time or System Date using the Arrow keys Enter new values through the keyboard Press the Tab key or the Arrow keys to move between fields The date must be entere...

Page 38: ...em devices You can select any of the items in the left frame of the screen to go to the sub menus Trusted Computing F81803 Super IO Configuration Hardware Monitor NCT7802Y HW Minitor Serial Port Console Redirection PCI Subsystem Settings USB Configuration Network Stack Configuration CSM Configuration For items marked with please press Enter for more options ...

Page 39: ...IMB700 LGA4189 ATX Motherboard AMI BIOS Setup Utility 33 Trusted Computing Enable or disable security device support ...

Page 40: ...er IO Configuration You can use this screen to select options for the Super IO Configuration and change the value of the selected option A description of the selected item appears on the right side of the screen For items marked with please press Enter for more options ...

Page 41: ... Setup Utility 35 Hardware Monitor This screen monitors hardware health status This screen displays the temperature of system and CPU cooling fans speed in RPM and system voltages VCC3V VIN2 VBAT 5VSBY and VIN1 Note CPU FAN FAN5 SYS FA FAN6 ...

Page 42: ...Motherboard 36 AMI BIOS Setup Utility NCT7802YHardware Monitor This screen monitors hardware health status This screen displays the temperature of system cooling fans speed in RPM and system voltages Note SYS FA FAN1 2 3 ...

Page 43: ...IMB700 LGA4189 ATX Motherboard AMI BIOS Setup Utility 37 Serial Port Console Redirection This screen allows you to set serial port console redirection ...

Page 44: ... Setup Utility PCI Subsystem Settings This screen allows you to set PCI Subsystem mode Above 4G Decoding Ebable or disable above 4G decoding SR IOV Support Ebable or disable SR IOV support BME DMA Mitigation Ebable or disable BME DMA Mitigation ...

Page 45: ...ip change should be claimed by XHCI driver USB Mass Storage Driver Support Enable Disable USB Mass Storage Driver Support Port 60 64 Emulation Enable Disable port60 64 emulation USB transfer time out The time out value for Control Bulk and Interrupt transfers Device reset time out USB mass storage device Start Unit command time out 待 BIOS RD 說明 Device power up delay Maximum time the device will ta...

Page 46: ...IMB700 LGA4189 ATX Motherboard 40 AMI BIOS Setup Utility Network Stack Configuration On this screen you can select PXE LAN port ...

Page 47: ...ROM Messages Set display mode for Option ROM INT19 Trap Response BIOS reaction on INT19 trapping by Option ROM IMMEDIATE execute the trap right away POSTPONED execute the trap during legacy boot HDD Connection Order OS requires HDD handles to be adjusted i e OS is installed on driver PCIe LAN IO Resource The user can choose to disable or enable this function Boot option filter This option controls...

Page 48: ...LGA4189 ATX Motherboard 42 AMI BIOS Setup Utility Video Controls the execution of UEFI and Legacy Video OpROM Other PCI devices Determines OpROM execution policy for devices other than Network Storage or Video ...

Page 49: ...set menu allows users to change the advanced chipset settings You can select any of the items in the left frame of the screen to go to the sub menus PCH Configuration PCI Express Configuration PCH SATA Configuration Azalia Configuration For items marked with please press Enter for more options ...

Page 50: ...IMB700 LGA4189 ATX Motherboard 44 AMI BIOS Setup Utility PCH Devices The screen shows PCH devices Wake From DeepSx Enable or disable the GP27 Wake From DeepSx ...

Page 51: ...IMB700 LGA4189 ATX Motherboard AMI BIOS Setup Utility 45 PCI Express Configuration The screen shows PCI Express Configuration ...

Page 52: ...s SATA Controller s Enable or disable the SATA Controller feature The default is Enabled Configuration SATA as Determine how SATA controller s operate Operation mode options are RAID and AHCI Advanced Host Controller Interface The default is the AHCI mode Port Enable or disable the SATA port Hot Plug Designates this port as Hot Pluggable SATA Device Type Identify whether the SATA port is connected...

Page 53: ...IMB700 LGA4189 ATX Motherboard AMI BIOS Setup Utility 47 Azalia Configuration This screen shows Azalia configuration ...

Page 54: ...48 AMI BIOS Setup Utility 4 6 Socket Configuration The socket configuration menu allows users to change the advanced socket settings Processor Configuration IIO Configuration For items marked with please press Enter for more options ...

Page 55: ...MB700 LGA4189 ATX Motherboard AMI BIOS Setup Utility 49 Processor Configuration This screen shows processor information and set TME function Total Memory Encryption TME Enable or disable the TME function ...

Page 56: ...IMB700 LGA4189 ATX Motherboard 50 AMI BIOS Setup Utility IIO Configuration This screen shows the IO configuration information ...

Page 57: ...curity menu allows users to change the security settings for the system Administrator Password This item indicates whether an administrator password has been set installed or uninstalled User Password This item indicates whether a user password has been set installed or uninstalled ...

Page 58: ...lect the power on state for the keyboard NumLock Quiet Boot Select to display either POST output messages or a splash screen during boot up Boot Option Priorities These are settings for boot priority Specify the boot device priority sequence from the available devices Optimized Boot When the system BIOS boots using native UEFI graphic drivers use this function to control and enable for compatibili...

Page 59: ...the system configuration and return to Main Menu Select Discard Changes and Exit from the Save Exit menu and press Enter Select Yes to discard changes and exit Save Changes and Reset When you have completed the system configuration changes select this option to leave Setup and reboot the computer so the new system configuration parameters can take effect Select Save Changes and Reset from the Save...

Page 60: ...s Restore Defaults It automatically sets all Setup options to a complete set of default settings when you select this option Select Restore Defaults from the Save Exit menu and press Enter Save as User Defaults Select this option to save system configuration changes done so far as User Defaults Select Save as User Defaults from the Save Exit menu and press Enter Restore User Defaults It automatica...

Page 61: ...triggers a system reset when it counts down to zero from a preset value The software starts the counter with an initial value and must reset it periodically If the counter ever reaches zero which means the software has crashed the system will reboot How to Use Watchdog Timer Start 1 Enable configuration O 2E 87 O 2E 87 2 Select logic device O 2E 07 O 2F 07 3 Enable WDT O 2E 30 O 2F 01 4 Activate W...

Page 62: ...rs after 1 second 02h Time out occurs after 2 seconds 03h Time out occurs after 3 seconds FFh Time out occurs after 255 seconds If N 08h the time base is set to minute M time value 00h Time out Disable 01h Time out occurs after 1 minute 02h Time out occurs after 2 minutes 03h Time out occurs after 3 minutes FFh Time out occurs after 255 minutes ...

Page 63: ...you will learn how to install the TPM 2 0 module into the IMB700 Please read and follow the instructions below carefully 1 Insert TPM module into the SPI interface of the motherboard as illustrated below 2 There are two ways to confirm whether the TPM Module is installed successfully or not a Enter the BIOS setup menu and go to Trusted Computing The first line will show TPM2 0 Device Found TPM SPI...

Page 64: ...uting In the Trusted Computing section the first line will show TPM2 0 Device Found if installation is successful b In the Windows 10 OS environment enter Device Manager and select the item of Security devices The screen will show Trusted Platform Module 2 0 if installation is successful ...

Page 65: ...rboard iAMT Settings 59 c In the Windows 10 OS environment enter Control Panel select the item of BitLocker Drive Encryption and enter TPM Administration The screen will show the information below if installation is successful ...

Page 66: ...IMB700 LGA4189 ATX Motherboard 60 iAMT Settings This page is intentionally left blank ...

Page 67: ...below to configure SATA hard drive s 1 Install SATA hard drive s in your system 2 Enter the BIOS Setup to configure SATA controller mode and boot sequence 3 Configure RAID by the RAID BIOS 1 Installing SATA hard drive s in your system Connect one end of the SATA signal cable to the rear of the SATA hard drive and the other end to available SATA port s on the board Then connect the power connector ...

Page 68: ... then press the Del button to enter BIOS Setup during running POST Power On Self Test If you want to create RAID just go to the Platform configuration PCH SATA Configuration select the Configuration SATA as and press Enter for more options A list of options appears please select RAID RAID ...

Page 69: ...MB700 LGA4189 ATX Motherboard Configuring SATA for RAID 63 2 2 Enable the Load EFI Driver for RAID 2 3 Under the Boot Settings menu set DVD ROM for First Boot Option to boot DVD ROM after system restarts ...

Page 70: ...IMB700 LGA4189 ATX Motherboard 64 Configuring SATA for RAID 2 4 Go to the Advanced screen select the Intel R VROC SATA Controller furtherly select the Cerate RAID Volume and press Enter for more options ...

Page 71: ...IMB700 LGA4189 ATX Motherboard Configuring SATA for RAID 65 2 5 Select the RAID Level and choose RAID0 1 or 5 for youe needs 2 6 Save and exit the BIOS Setup ...

Page 72: ...IMB700 LGA4189 ATX Motherboard 66 Configuring SATA for RAID This page is intentionally left blank ...

Page 73: ...used as a pointer to determine which of the following registers will be written or read Register 0 Input port register This register is a read only port It reflects the incoming logic levels of the pins regardless of whether the pin is defined as an input or an output by Register 3 Writes to this register have no effect The default X is determined by the externally applied logic level normally 1 w...

Page 74: ...O4 R 1 3 O3 R 1 2 O2 R 1 1 O1 R 1 0 O0 R 1 Default value Register 2 Configuration register This register configures the directions of the I O pins If a bit in this register is set the corresponding port pin is enabled as an input with high impedance output driver If a bit in this register is cleared the corresponding port pin is enabled as an output At reset the I Os are configured as inputs with ...

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