UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 98 of 841
NXP Semiconductors
UM10360
Chapter 7: LPC176x/5x Pin configuration
P0[20] / DTR1 /
SCL1
58 - I/O P0[20] — General purpose digital input/output pin.
O
DTR1 — Data Terminal Ready output for UART1. Can also be configured
to be an RS-485/EIA-485 output enable signal.
I/O
SCL1 — I
2
C1 clock input/output (this pin does not use a specialized I2C
pad, see Section 19.1
for details).
P0[21] / RI1 / RD1 57
- I/O P0[21] — General purpose digital input/output pin.
I
RI1 — Ring Indicator input for UART1.
I
RD1 — CAN1 receiver input.
P0[22] / RTS1 / TD1 56 44 I/O
P0[22] — General purpose digital input/output pin.
O
RTS1 — Request to Send output for UART1. Can also be configured to be
an RS-485/EIA-485 output enable signal.
O
TD1 — CAN1 transmitter output.
P0[23] / AD0[0] /
I2SRX_CLK /
CAP3[0]
9- I/O
P0[23] — General purpose digital input/output pin. When configured as an
ADC input, digital section of the pad is disabled.
I
AD0[0] — A/D converter 0, input 0.
I/O
I2SRX_CLK — Receive Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the
I
2
S-bus specification.
I
CAP3[0] — Capture input for Timer 3, channel 0.
P0[24] / AD0[1] /
I2SRX_WS /
CAP3[1]
8- I/O
P0[24] — General purpose digital input/output pin. When configured as an
ADC input, digital section of the pad is disabled.
I
AD0[1] — A/D converter 0, input 1.
I/O
I2SRX_WS — Receive Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the
I
2
S-bus
specification.
I
CAP3[1] — Capture input for Timer 3, channel 1.
P0[25] / AD0[2] /
I2SRX_SDA /
TXD3
77I/O
P0[25] — General purpose digital input/output pin. When configured as an
ADC input, digital section of the pad is disabled.
I
AD0[2] — A/D converter 0, input 2.
I/O
I2SRX_SDA — Receive data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the
I
2
S-bus specification.
O
TXD3 — Transmitter output for UART3.
P0[26] / AD0[3] /
AOUT / RXD3
66I/O
P0[26] — General purpose digital input/output pin. When configured as an
ADC input or DAC output, the digital section of the pad is disabled.
I
AD0[3] — A/D converter 0, input 3.
O
AOUT — D/A converter output.
I
RXD3 — Receiver input for UART3.
P0[27] / SDA0 /
USB_SDA
25 - I/O
P0[27] — General purpose digital input/output pin. Open-drain 5 V tolerant
digital I/O pad, compatible with I
2
C-bus specifications for 100 kHz standard
mode, 400 kHz Fast Mode, and 1 MHz Fast Mode Plus. This pad requires
an external pull-up to provide output functionality. When power is switched
off, this pin connected to the I
2
C-bus is floating and does not disturb the
I
2
C lines. Open-drain configuration applies to all functions on this pin.
I/O
SDA0 — I
2
C0 data input/output (this pin uses a specialized I2C pad, see
Section 19.1
for details).
I/O
USB_SDA — USB port I
2
C serial data (OTG transceiver).
Table 73. Pin description …continued
Symbol LQFP
100
LQFP
80
Type Description
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