P89LPC914 datasheet(8/63 Pages) PHILIPS

Part #	P89LPC914

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

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

P89LPC912/913/914

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 03 — 17 December 2004

8 of 63

9397 750 14468

6.2 Pin description

Table 3:

P89LPC912 pin description

Symbol

Type

Description

P0.2, P0.4 to

P0.6

I/O

Port 0: Port 0 is a 4-bit 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

9.11.1 “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:

13

I/O

P0.2 — Port 0 bit 2.

I

CIN2A — Comparator 2 positive input A.

I

KBI2 — Keyboard input 2.

12

I/O

P0.4 — Port 0 bit 4.

I

CIN1A — Comparator 1 positive input A.

I

KBI4 — Keyboard input 4.

11

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.

P1.2, P1.5

I/O

(P1.2);

I (P1.5)

Port 1: Port 1 is a 2-bit I/O port with P1.2 having a user-conﬁgurable output type as

noted below. During reset Port 1 latches are conﬁgured in the input only mode with

the internal pull-up disabled. The operation of the P1.2 input and outputs depends

upon the port conﬁguration selected. Refer to Section 9.11.1 “Port conﬁgurations” and

Table 13 “DC electrical characteristics” for details. P1.2 is an open drain when used as

an output. P1.5 is input only.

All pins have Schmitt triggered inputs.

Port 1 also provides various special functions as described below:

6

I/O

P1.2 — Port 1 bit 2. (Open drain when used as an output.)

I/O

T0 — Timer/counter 0 external count input or overﬂow output. (Open drain when used

as outputs.).

3I

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. 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.

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