P89LPC9107 데이터 시트보기 (PDF) - Philips Electronics

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P89LPC9107

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

P89LPC9102/9103/9107

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

Table 6: P89LPC9107 pin description …continued

Symbol

Pin

Type Description

P1.0 to P1.2,

P1.5

I/O

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 12 “Static

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

All pins have Schmitt triggered inputs.

Port 1 also provides various special functions as described below:

P1.0/TXD

6

I/O

P1.0 — Port 1 bit 0.

O

TXD — Serial port transmitter data.

P1.1/RXD

9

I/O

P1.1 — Port 1 bit 1.

I

RXD — Serial port receiver data.

P1.2/T0

7

I/O

P1.2 — Port 1 bit 2.

I/O

T0 — Timer/counter 0 external count input or overflow/PWM output.

P1.5/RST

3

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. 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.

VSS

4

I

Ground: 0 V reference.

VDD

10

I

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

mode and Power-down mode.

9397 750 14655

Product data sheet

Rev. 02 — 11 April 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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