Philips 8-bit microcontroller with two-clock 80C51 core UM10109 Manual De Usuario

 

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

P0.0 to P0.7

3, 26, 25, 
24, 23, 22, 
20, 19

27, 22, 21, 
20, 19, 18, 
16, 15

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 

 and 

the P89LPC932A1 data sheet, Static 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:

3

27

I/O

P0.0 — Port 0 bit 0.

O

CMP2 — Comparator 2 output.

I

KBI0 — Keyboard input 0.

26

22

I/O

P0.1 — Port 0 bit 1.

I

CIN2B — Comparator 2 positive input B.

I

KBI1 — Keyboard input 1.

25

21

I/O

P0.2 — Port 0 bit 2.

I

CIN2A — Comparator 2 positive input A.

I

KBI2 — Keyboard input 2.

24

20

I/O

P0.3 — Port 0 bit 3.

I

CIN1B — Comparator 1 positive input B.

I

KBI3 — Keyboard input 3.

23

19

I/O

P0.4 — Port 0 bit 4.

I

CIN1A — Comparator 1 positive input A.

I

KBI4 — Keyboard input 4.

22

18

I/O

P0.5 — Port 0 bit 5.

I

CMPREF — Comparator reference (negative) input.

I

KBI5 — Keyboard input 5.