P89LPC901 PHILIPS [NXP Semiconductors], P89LPC901 Datasheet - Page 8

• Manufacturer Part Number: P89LPC901
• Description: 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 3:
9397 750 12293
Product data
Symbol
P0.0 - P0.6
P1.0 - P1.5
Fig 8. P89LPC903 pinning (SO8).
P89LPC901 pin description
Pin
6, 7
7
6
4, 5
5
4
5.2 Pin description
Type
I/O
I/O
I
I
I/O
I
I
I/O
O
I
I
handbook, halfpage
Description
Port 0: Port 0 is an I/O port with a user-configurable output type. During reset Port 0
latches are configured in the input only mode with the internal pull-up disabled. The
operation of Port 0 pins as inputs and outputs depends upon the port configuration
selected. Each port pin is configured independently. Refer to
configurations”
The Keypad Interrupt feature operates with Port 0 pins.
All pins have Schmitt triggered inputs.
Port 0 also provides various special functions as described below:
P0.4 — Port 0 bit 4.
CIN1A — Comparator 1 positive input.
KBI4 — Keyboard input 4.
P0.5 — Port 0 bit 5.
CMPREF — Comparator reference (negative) input.
KBI5 — Keyboard input 5.
Port 1: Port 1 is an I/O port with a user-configurable output type. 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
electrical characteristics”
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below:
P1.2 — Port 1 bit 2.
T0 — Timer/counter 0 external count input or overflow output.
P1.5 — Port 1 bit 5 (input only).
RST — External Reset input during Power-on or if selected via UCFG1. When
functioning as a reset input 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. Also used during a power-on sequence to force In-System
Programming mode.
P0.2/CIN2A/KBI2
RST/P1.5
P1.1/RxD
Rev. 04 — 21 November 2003
V DD
and
1
2
3
4
Table 13 “DC electrical characteristics”
002aaa440
Section 8.12.1 “Port configurations”
for details. P1.5 is input only.
8-bit microcontrollers with two-clock 80C51 core
8
7
6
5
V SS
P0.4/CIN1A/KBI4
P0.5/CMPREF/KBI5
P1.0/TxD
P89LPC901/902/903
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
for details.
and
Section 8.12.1 “Port
Table 13 “DC
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