MSM6352 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM6352

Built-in DTMF Generator 4-Bit Microcontroller

Oki Electric Industry 

¡ Semiconductor

MSM6352

PIN DESCRIPTIONS

Symbol

VDD

VSS

AC

TEST

XT, XT

HS

DP OUT

DTMF OUT

BD

32 kHz

R1 to R4

R5 to R8

I1 to I4

C1 to C4

O1 to O4

IO1 to IO4

IOE

Description

Power source

Circuit ground potential

Pin to clear internal logic, pulled down to VSS.

After power is turned on, the MSM6352 must be reset by this pin.

Pin to test internal logic, pulled down to VSS.

This pin must be open in normal operation.

Input and output pins of oscillator inverter.

3.58 MHz ceramic resonator and capacitors is connedted to these pins.

Input pin connected to the hook switch, pulled up to VDD.

Output pin of dial pulse

Dial pulse rate (10 pps or 20 pps) and Make Break ratio (40% or 33%) can be selected by

software.

Output pin of DTMF signal

Output pin of buzzer sound

Output pin of 32 kHz clock

Input port pulled down to VSS

Input port having clocked pull-down resistor to VSS

Only when this port is accessed, pull-down resistors are connected to this port.

Output port

Tri-state bidirectional port

Output pin

When IO1-IO4 is accessed, input completion signal (when read) or load signal (when written)

is output from IOE pin.

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