Philips Semiconductors

 

 

 

User’s Manual - Preliminary -

 

 

 

 

 

 

GENERAL DESCRIPTION

P89LPC906/907/908

PIN DESCRIPTIONS - P89LPC907

 

 

 

 

 

 

 

 

 

Mnemonic

Pin no.

Type

Name and function

 

 

P0.4 - P0.6

3, 7,8

I/O

Port 0:

Port 0 is an I/O port with a user-configurable output types. During reset Port

 

 

 

 

0 latches are configured in the input only mode with the internal pullup

 

 

 

 

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 the section Port Configurations on page 35 and the DC Electrical

 

 

 

 

Characteristics in the datasheet 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.

 

8

I/O

P0.4

Port 0 bit 4.

 

 

 

 

I

CIN1A

Comparator 1 positive input.

 

 

 

 

I

KBI4

Keyboard Input 4.

 

 

 

7

I/O

P0.5

Port 0 bit 5.

 

 

 

 

I

CMPREFComparator reference (negative) input.

 

 

 

 

I

KBI5

Keyboard Input 5.

 

 

 

3

I/O

P0.6

Port 0 bit 6.

 

 

 

 

O

CMP1

Comparator 1 output.

 

 

 

 

I

KBI6

Keyboard Input 6.

 

 

P1.0-P1.5

1,4,5

 

Port 1:

Port 1 is an I/O port with a user-configurable output types. During reset Port

 

 

 

 

1 latches are configured in the input only mode with the internal pull-up

 

 

 

 

disabled. The operation of the configurable port 1 pins as inputs and

 

 

 

 

outputs depends upon the port configuration selected. Each of the

 

 

 

 

configurable port pins are programmed independently. Refer to the section

 

 

 

 

Port Configurations on page 35 and the DC Electrical Characteristics in the

 

 

 

 

datasheet for details.

 

 

 

 

 

P1.5 is input only.

 

 

 

 

 

All pins have Schmitt triggered inputs.

 

 

 

 

 

Port 1 also provides various special functions as described below.

 

5

I/O

P1.0

Port 1 bit 0.

 

 

 

 

O

TxD

Serial port transmitter data.

 

 

 

4

I/O

P1.2

Port 1 bit 2.

 

 

 

 

I/O

T0

Timer 0 external clock input, toggle output, PWM output.

 

1

I

P1.5

Port 1 bit 5. (Input only)

 

 

 

 

I

RST

External Reset input during power-on or if selected via UCFG1. When

 

 

 

 

functioning as a reset input a low on this pin resets the microcontroller,

 

 

 

 

causing I/O ports and peripherals to take on their default states, and the

 

 

 

 

processor begins execution at address 0. Also used during a power-on

 

 

 

 

sequence to force In-Circuit Programming mode.

VSS

2

I

Ground: 0V reference.

 

 

VDD

6

I

Power Supply: This is the power supply voltage for normal operation as well as Idle

 

 

 

and Power down modes.

 

 

2003 Dec 8

13

Page 13
Image 13
Philips P89LPC908, P89LPC906 user manual PIN Descriptions P89LPC907, P1.0, TxD, P1.2