P89LPC921 datasheet(6/45 Pages) PHILIPS

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Philips Semiconductors

P89LPC920/921/922

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 06 — 21 November 2003

6 of 45

9397 750 12285

5.2 Pin description

Table 3:

Pin description

Symbol

Type

Description

P0.0 - P0.7

1, 20, 19,

18, 17, 16,

14, 13

I/O

Port 0: Port 0 is an 8-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 8.12.1 “Port

conﬁgurations” and Table 8 “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:

I/O

P0.0 — Port 0 bit 0.

CMP2 — Comparator 2 output.

KBI0 — Keyboard input 0.

I/O

P0.1 — Port 0 bit 1.

CIN2B — Comparator 2 positive input B.

KBI1 — Keyboard input 1.

I/O

P0.2 — Port 0 bit 2.

CIN2A — Comparator 2 positive input A.

KBI2 — Keyboard input 2.

I/O

P0.3 — Port 0 bit 3.

CIN1B — Comparator 1 positive input B.

KBI3 — Keyboard input 3.

I/O

P0.4 — Port 0 bit 4.

CIN1A — Comparator 1 positive input A.

KBI4 — Keyboard input 4.

I/O

P0.5 — Port 0 bit 5.

CMPREF — Comparator reference (negative) input.

KBI5 — Keyboard input 5.

I/O

P0.6 — Port 0 bit 6.

CMP1 — Comparator 1 output.

KBI6 — Keyboard input 6.

I/O

P0.7 — Port 0 bit 7.

I/O

T1 — Timer/counter 1 external count input or overﬂow output.

KBI7 — Keyboard input 7.

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