P89LPC970FDH datasheet(7/66 Pages) NXP

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P89LPC97X_2

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Product data sheet

Rev. 02 — 27 April 2010

7 of 66

NXP Semiconductors

P89LPC970/971/972

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

6.2 Pin description

Table 3.

Pin description

Symbol

Type

Description

DIP20,

TSSOP20

P0.0 to P0.7

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

7.16.1 “Port configurations” and Table 11 “Static characteristics” for details.

The Keypad Interrupt feature operates with Port 0 pins.

All pins have Schmitt trigger inputs.

Port 0 also provides various special functions as described below:

P0.0/CMP2/KBI0/

SPICLK

1I/O

P0.0 — Port 0 bit 0.

CMP2 — Comparator 2 output

KBI0 — Keyboard input 0.

I/O

SPICLK — SPI clock. When configured as master, this pin is output; when

configured as slave, this pin is input (pin remap).

P0.1/CIN2B/

KBI1

I/O

P0.1 — Port 0 bit 1.

CIN2B — Comparator 2 positive input B.

KBI1 — Keyboard input 1.

P0.2/CIN2A/

KBI2

I/O

P0.2 — Port 0 bit 2.

CIN2A — Comparator 2 positive input A.

KBI2 — Keyboard input 2.

P0.3/CIN1B/

KBI3/T2

I/O

P0.3 — Port 0 bit 3. High current source.

CIN1B — Comparator 1 positive input B.

KBI3 — Keyboard input 3.

I/O

T2 — Timer/counter 2 external count input or overflow output.

P0.4/CIN1A/

KBI4

I/O

P0.4 — Port 0 bit 4. High current source.

CIN1A — Comparator 1 positive input A.

KBI4 — Keyboard input 4.

P0.5/CMPREF/

KBI5/T3

I/O

P0.5 — Port 0 bit 5. High current source.

CMPREF — Comparator reference (negative) input.

KBI5 — Keyboard input 5.

I/O

T3 — Timer/counter 3 external count input or overflow output.

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