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LPC920F Datasheet PDF : 45 Pages
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Philips Semiconductors
P89LPC920/921/922
8-bit microcontrollers with two-clock 80C51 core
Table 3: Pin description…continued
Symbol
Pin
Type Description
P1.0 - P1.7
12, 11, 10,
9, 8, 4, 3,
2
I/O, I [1] Port 1: Port 1 is an 8-bit I/O port with a user-configurable output type, except for three
pins as noted below. During reset Port 1 latches are configured in the input only mode
with the internal pull-up disabled. The operation of the configurable Port 1 pins as inputs
and outputs depends upon the port configuration selected. Each of the configurable
port pins are programmed independently. Refer to Section 8.12.1 “Port configurations”
and Table 8 “DC electrical characteristics” for details. P1.2 - P1.3 are open drain when
used as outputs. P1.5 is input only.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below:
12
I/O P1.0 — Port 1 bit 0.
O
TXD — Transmitter output for the serial port.
11
I/O P1.1 — Port 1 bit 1.
I
RXD — Receiver input for the serial port.
10
I/O P1.2 — Port 1 bit 2 (open-drain when used as output).
I/O T0 — Timer/counter 0 external count input or overflow output (open-drain when used as
output).
I/O
SCL — I2C serial clock input/output.
9
I/O P1.3 — Port 1 bit 3 (open-drain when used as output).
I
INT0 — External interrupt 0 input.
I/O
SDA — I2C serial data input/output.
8
I/O P1.4 — Port 1 bit 4.
I
INT1 — External interrupt 1 input.
4
I
P1.5 — Port 1 bit 5 (input only).
I
RST — External Reset input (if selected via FLASH configuration). A LOW on this pin
resets the microcontroller, causing I/O ports and peripherals to take on their default
states, and the processor begins execution at address 0.
3
I/O P1.6 — Port 1 bit 6.
2
I/O P1.7 — Port 1 bit 7.
9397 750 12285
Product data
Rev. 06 — 21 November 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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