P89LPC904 데이터 시트보기 (PDF) - Philips Electronics

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P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter

Philips Electronics 

Philips Semiconductors

P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core

Table 3: P89LPC904 pin description…continued

Symbol

Pin

Type Description

P1.0 to P1.5 3, 4, 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 Section 8.13.1 “Port configurations” and Table 8 “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:

5

I/O

P1.0 — Port 1 bit 0.

O

TxD — Serial port transmitter data.

3

I/O

P1.1 — Port 1 bit 1.

I

RxD — Serial port receiver data.

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 13521

Preliminary data

Rev. 02 — 25 June 2004

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

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