UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
295 of 1269
NXP Semiconductors
UM10503
Chapter 15: LPC43xx System Control Unit (SCU)/ IO configuration
15.4.5 Pin configuration register for open-drain I
2
C-bus pins
Table 136. Pin configuration for pins USB1_DP/USB1_DM register (SFSUSB, address 0x4008
6C80) bit description
Bit
Symbol
Value Description
Reset
value
Access
0
USB_AIM
Differential data input AIP/AIM.
0
R/W
0
Going LOW with full speed edge rate
1
Going HIGH with full speed edge rate
1
USB_ESEA
Control signal for differential input or single input.
1
R/W
0
Reserved. Do not use.
1
Single input. Enables USB1. Use with the on-chip
full-speed PHY.
2
USB_EPD
Enable pull-down connect.
0
R/W
0
Pull-down disconnected
1
Pull-down connected
3
-
Reserved
-
-
4
USB_EPWR
Power mode.
0
R/W
0
Power saving mode (Suspend mode)
1
Normal mode
5
USB_VBUS
Enable the vbus_valid signal. This signal is
monitored by the USB1 block. Use this bit for
software de-bouncing of the VBUS sense signal or
to indicate the VBUS state to the USB1 controller
when the VBUS signal is present but the
USB1_VBUS function is not connected in the
SFSP2_5 register.
Remark:
The setting of this bit has no effect if the
USB1_VBUS function of pin P2_5 is enabled
through the SFSP2_5 register.
0
R/W
0
VBUS signal LOW or inactive
1
VBUS signal HIGH or active
31:6
-
Reserved
-
-
Table 137. Pin configuration for open-drain I
2
C-bus pins register (SFSI2C0, address 0x4008
6C84) bit description
Bit
Symbol
Value
Description
Reset
value
Access
0
SCL_EFP
Select input glitch filter time constant for the
SCL pin.
0
R/W
0
50 ns glitch filter
1
3 ns glitch filter
1
-
Reserved. Always write a 0 to this bit.
0
R/W
2
SCL_EHD
Select I2C mode for the SCL pin.
0
R/W
0
Standard/Fast mode transmit
1
Fast-mode Plus transmit