Nokia 8550 Manuale Di Servizio

NSM–3/3D
System Module

PAMS Technical Documentation

Page  28

Issue 4  02/2002

 Nokia Corporation

used for the sleep mode timing. The sleep clock is active when there is a
battery voltage available i.e. always when the battery is connected.

MCUGemIO 0

O

2

0

MCU General

purpose output

port

LEADGND

Lead Ground

Col4

I/O

UIF

2

Input

program-

mable pullup

PR0201

I/O line for key-

board column 4

Col3

I/O

UIF

2

Input

program-

mable pullup

PR0201

I/O line for key-

board column 3

MCUGenIO1

I/O

2

Input,

pullup

pullup

PR0201

General purpose

I/O port

Ground

Col2

I/O

UIF

2

Input

program-

mable pullup

PR0201

I/O line for key-

board column 2

Col1

I/O

UIF

2

Input

program-

mable pullup

PR0201

I/O line for key-

board column 1

Col0

I/O

UIF

2

Input

program-

mable pullup

PR0201

I/O line for key-

board column 0

LCDCSX

I/O

UIF

2

Input

external

pullup/down

serial LCD driver

chip select, par-

allel LCD driver

enable

LEADVCC

Lead Power

LoByteSelX

NC

Row5LCDCD

I/O

UIF

2

Input,

pullup

pullup

PR0201

Keyboard row5

data I/O , serial

LCD driver com-

mand/data indi-

cator, parallel

LCD driver read/

write select

Core VCC in

3325c10

Power

Row4

I/O

UIF

2

Input,

pullup

pullup

PR0201

I/O line for key-

board row 4, par-

allel LCD driver

register selection

control

Row3

I/O

UIF

2

Input,

pullup

pullup

PR0201

I/O line for key-

board row 3, par-

allel LCD driver

data