MSM7502 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Fabricante

MSM7502

Multi-Function PCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7502

PO0, PO1, PO2, PO3, PO4, PO5, PO6, PO7

Key scanning outputs.

These output pins need external pull-up resistors because of their open- drain circuits. But, when

these are used in combination with PI0 to PI7, pull-up resistors are not required. Through

processor control, these outputs can be set open or to digital "0". Initially, these outputs are set

at an opened state.

PI0, PI1, PI2, PI3, PI4, PI5, PI6, PI7

Key scanning inputs.

In the READ mode, data on PI0 to PI7 can be read out of the processor via data bus (DB0 to DB7).

Since these inputs are pulled up inside the IC, external resistors are not required.

INTT

Interrupt signal output to the processor.

INTT outputs interrupt signals (digital "0") at intervals of 8 ms by the interrupt release control

signal from the processor. This output keeps digital "0" unless the interrupt is released. INTT

does not output any signal while no XSYNC signal is input. When the RESETN signal is in "0"

state, INTT is in "1" state. INTT goes from "1" state to "0" state 8 ms after the RESETN signal goes

to "1" state.

Interrupt release signal

from processor

t < 8 ms

8 ms < t < 16 ms

t < 8 ms

INTT output

8 ms

16 ms

8 ms

DB0, DB1, DB2, DB3, DB4, DB5, DB6, DB7

Data bus inputs and outputs.

These pins are configured as an output during the READ mode only and as an input during other

modes.

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