P89LPC906 查看數據表（PDF） - Philips Electronics

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P89LPC906

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

Philips Electronics 

Philips Semiconductors

P89LPC906/907/908

8-bit microcontrollers with two-clock 80C51 core

5.2 Pin description

Table 3: P89LPC906 pin description

Symbol

Pin

Type Description

P0.4 to P0.6

I/O

Port 0: Port 0 is an I/O port with a user-configurable output types. 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 8.11.1 “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:

8

I/O

P0.4 — Port 0 bit 4.

I

CIN1A — Comparator positive input.

I

KBI4 — Keyboard input 4.

7

I/O

P0.5 — Port 0 bit 5.

I

CMPREF — Comparator reference (negative) input.

I

KBI5 — Keyboard input 5.

3

I/O

P0.6 — Port 0 bit 6.

O

CMP1 — Comparator 1 output.

I

KBI6 — Keyboard input 6.

P1.5

I

P1.5 — Port 1 bit 5 (input only).

1

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. When using an oscillator frequency above 12 MHz, the

reset input function of P1.5 must be enabled. An external circuit is required to

hold the device in reset at power-up until VDD has reached its specified level.

When system power is removed VDD will fall below the minimum specified

operating voltage. When using an oscillator frequency above 12 MHz, in some

applications, an external brownout detect circuit may be required to hold the

device in reset when VDD falls below the minimum specified operating voltage.

9397 750 14467

Product data

Rev. 05 — 17 December 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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