參數(shù)資料
型號(hào)： MSM7502
廠商： OKI SEMICONDUCTOR CO., LTD.
元件分類： Codec
英文描述： Multi-Function PCM CODEC
中文描述： 多功能的PCM編解碼器
文件頁(yè)數(shù)： 10/35頁(yè)
文件大小： 196K
代理商： MSM7502
Semiconductor
MSM7502
10/35
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
INTT output
t < 8 ms
8 ms < t < 16 ms
t < 8 ms
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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