TWRMCF51JGUM
TWR-MCF51JG Tower Module User's Manual
Page 17 of 21
J10
Regulator Power Source
Selection
*1-2*
*5-6*
Refer to Table 1
J12
MCU Voltage Selector
*1-2*
Power MCU from board power source selection
jumper (J9).
2-3
Power MCU with output of on-chip voltage
regulator (VOUT33).
J13
OSBDM Mode Selection
ON
OSBDM bootloader mode (OSBDM firmware
reprogramming)
*OFF*
Debugger mode
J15
EzPort Power Connection
ON
Connect on-board 5V supply to EzPort header
(supports powering board from external EzPort
probe)
*OFF*
Disconnect on-board 5V supply from EzPort
header
4
Input/Output Connectors and Pin Usage Table
The following table provides details on which MCF51JG pins are using to communicate with the LEDs,
switches, and other I/O interfaces onboard the TWR-MCF51JG.
Note:
Some port pins are used in multiple interfaces on-board and many are potentially connected to
off-board resources via the Tower Primary Connector. Take care to avoid attempted simultaneous
usage of mutually exclusive features.
Table 6.
I/O Connectors and Pin Usage Table
Feature
Connection
Port Pin
Pin Function
Shared With
OSBDM/USB
Bridge
UART Receive
PTB5
SCI2_RX
SPI2_MISO
UART Transmit
PTB4
SCI2_TX
SPI2_MOSI
USB OTG
Data Negative
USB0_DN Differential Data
Data Positive
USB0_DP
Differential Data
EZPORT
EZPort Clock
PTB0
EZP_CLK
TWRPI, USB
OTG
EZPort Data Out
PTA6
EZP_DO
TWRPI, SAI
EZPort Data In
PTA7
EZP_DI
TWRPI
EZPort Chip Select
PTB1
EXP_CS_B
IRQ0/SW1
Reset
RESET_B
JG_RESET_B
Switches
SW1
PTB1
IRQ0
EZP_CS_B
SW2
PTC1
IRQ3
FTM1_CH5
SW3
RESET_B
Reset
SAI
SAI Receive FS
PTA6
SAI0_RX_FS
EZPORT, TWRPI