P89LPC9321 datasheet(8/70 Pages) NXP

8 / 70 page

P89LPC9321_1

Product data sheet

Rev. 01 — 9 December 2008

8 of 70

NXP Semiconductors

P89LPC9321

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

6.2 Pin description

Table 3.

Pin description

Symbol

Type Description

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 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:

P0.0/CMP2/

KBI0

I/O

P0.0 — Port 0 bit 0.

CMP2 — Comparator 2 output

KBI0 — Keyboard input 0.

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

I/O

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

CIN1B — Comparator 1 positive input B.

KBI3 — Keyboard input 3.

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

I/O

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

CMPREF — Comparator reference (negative) input.

KBI5 — Keyboard input 5.

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