¡ Semiconductor

MSM9554/MSM9555

4

PIN DESCRIPTION

Function

Pin

Type

Description

Micro-

controller

interface

16

I

Write signal to internal register

18

I

Read signal to internal register

15

O

Interrupt signal to microcontroller. "L": Occurrence of an

interrupt

31

I

Chip select signal.

"L": Read, write, and data bus signals valid

40

I

"L" initializes internal registers, and the device enters

power down mode

33 to 38

I

Address signal to internal register

19 to 26

I/O

Data bus signal to internal register

6

I

FM multiplex signal input

5

O

Analog reference voltage output pin. To prevent noise,

connect a capacitor between this pin and analog ground.

1

O

Analog section waveform monitor pin. The analog block is

specified by the analog control register.

2

I

Analog signal input pin for testing

41

42

I

Digital section test signal input pins. Internally pulled up.

8 to 14

O

Digital section test signal output and monitor output pins

29

I

8.192MHz crystal oscillator connection pin

30

O

8.192MHz crystal oscillator connection pin

32

O

Pin for supply of 64kHz to 8.192MHz clock to the outside

7

I

XOUT output control pin.

"L"=Clock output, "H"=Output disabled. Pulled up internally.

3

—

Analog section power supply pin

4

—

Analog ground pin

28

—

Digital section power supply pin

27

—

Digital ground pin

Tuner

interface

Analog

section test

Digital

section test

Clock

Power

supply

Symbol

WR

RD

INT

CS

CLR

A0 to A5

DB0 to DB7

SG

MON

ADETIN

IORD

IOWR

MOUT0 to

MOUT6

XTAL1

XTAL2

XOUT

XOUTC

AGND

DGND