P89LPC920FDH PHILIPS [NXP Semiconductors], P89LPC920FDH Datasheet - Page 7

• Manufacturer Part Number: P89LPC920FDH
• Description: 8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 3:
9397 750 12285
Product data
Symbol
P1.0 - P1.7
Pin description
Pin
12, 11, 10,
9, 8, 4, 3,
2
12
11
10
9
8
4
3
2
Type
I/O, I
I/O
O
I/O
I
I/O
I/O
I/O
I/O
I
I/O
I/O
I
I
I
I/O
I/O
…continued
[1]
Description
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
and
used as outputs. P1.5 is input only.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below:
P1.0 — Port 1 bit 0.
TXD — Transmitter output for the serial port.
P1.1 — Port 1 bit 1.
RXD — Receiver input for the serial port.
P1.2 — Port 1 bit 2 (open-drain when used as output).
T0 — Timer/counter 0 external count input or overflow output (open-drain when used as
output).
SCL — I
P1.3 — Port 1 bit 3 (open-drain when used as output).
INT0 — External interrupt 0 input.
SDA — I
P1.4 — Port 1 bit 4.
INT1 — External interrupt 1 input.
P1.5 — Port 1 bit 5 (input only).
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.
P1.6 — Port 1 bit 6.
P1.7 — Port 1 bit 7.
Table 8 “DC electrical characteristics”
2
2
C serial clock input/output.
C serial data input/output.
Rev. 06 — 21 November 2003
8-bit microcontrollers with two-clock 80C51 core
P89LPC920/921/922
for details. P1.2 - P1.3 are open drain when
Section 8.12.1 “Port configurations”
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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