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P89LPC9321

8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable flash with 512-byte data EEPROM

NXP Semiconductors. 

NXP Semiconductors

P89LPC9321

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

6.2 Pin description

Table 3. Pin description

Symbol

Pin

P0.0 to P0.7

P0.0/CMP2/

3

KBI0

P0.1/CIN2B/

26

KBI1

P0.2/CIN2A/

25

KBI2

P0.3/CIN1B/

24

KBI3

P0.4/CIN1A/

23

KBI4

P0.5/CMPREF/

22

KBI5

Type Description

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 10 “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:

I/O P0.0 — Port 0 bit 0.

O CMP2 — Comparator 2 output

I

KBI0 — Keyboard input 0.

I/O P0.1 — Port 0 bit 1.

I

CIN2B — Comparator 2 positive input B.

I

KBI1 — Keyboard input 1.

I/O P0.2 — Port 0 bit 2.

I

CIN2A — Comparator 2 positive input A.

I

KBI2 — Keyboard input 2.

I/O P0.3 — Port 0 bit 3. High current source.

I

CIN1B — Comparator 1 positive input B.

I

KBI3 — Keyboard input 3.

I/O P0.4 — Port 0 bit 4. High current source.

I

CIN1A — Comparator 1 positive input A.

I

KBI4 — Keyboard input 4.

I/O P0.5 — Port 0 bit 5. High current source.

I

CMPREF — Comparator reference (negative) input.

I

KBI5 — Keyboard input 5.

P89LPC9321_1

Product data sheet

Rev. 01 — 9 December 2008

© NXP B.V. 2008. All rights reserved.

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