P89LPC901 데이터 시트보기 (PDF) - Philips Electronics

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P89LPC901

8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM

Philips Electronics 

Philips Semiconductors

P89LPC901/902/903

8-bit microcontrollers with two-clock 80C51 core

Table 4: P89LPC902 pin description

Symbol

Pin

Type Description

P0.0 - P0.6

2, 3, 5, 6, I/O

7

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 Section 8.12.1 “Port

configurations” and Table 13 “DC electrical characteristics” for details.

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:

3

I/O

P0.0 — Port 0 bit 0.

I

CMP2 — Comparator 2 output.

I

KBI0 — Keyboard input 0.

2

I/O

P0.2 — Port 0 bit 2.

I

CIN2A — Comparator 2 positive input.

I

KBI2 — Keyboard input 2.

7

I/O

P0.4 — Port 0 bit 4.

I

CIN1A — Comparator 1 positive input.

I

KBI4 — Keyboard input 4.

6

I/O

P0.5 — Port 0 bit 5.

I

CMPREF — Comparator reference (negative) input.

I

KBI5 — Keyboard input 5.

5

I/O

P0.6 — Port 0 bit 6.

O

CMP1 — Comparator 1 output.

I

KBI6 — Keyboard input 6.

P1.0 - P1.5 4

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 Section 8.12.1 “Port configurations” and Table 13 “DC

electrical characteristics” for details. P1.5 is input only.

All pins have Schmitt triggered inputs.

Port 1 also provides various special functions as described below:

4

I

P1.5 — Port 1 bit 5 (input only).

I

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.

VSS

8

I

Ground: 0 V reference.

VDD

1

I

Power Supply: This is the power supply voltage for normal operation as well as Idle

and Power-down modes.

9397 750 12293

Product data

Rev. 04 — 21 November 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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