MSM6895 Datasheet, PDF (12/43 Pages) OKI electronic componets – Multi-Function PCM CODEC

¡ Semiconductor
MSM6895/6896
AD0, AD1
Address data inputs for the internal control registers.
Addressing of the internal control registers is executed by AD0 and AD1 and sub address data,
DB7 and DB6.
Write
Read
AD1
0
0
0
0
0
1
1
1
1
1
1
AD0
0
0
0
0
1
0
1
1
1
1
0
DB7
0
0
1
1
—
—
0
0
1
1
—
DB6
Function
0 Sounder Control
1 Control of function key acknowledge tone
0 PB tone control
Control of the internal control latch and the general-purpose latch,
1
Reset control of the watch dog timer.
— Control of channel selector
— Key scanning output control, interrupt release control
0 Volume control and tone combination control of sounder
1 CODEC power down control
Level control of transmit path, PB tone, and Hold tone, Gain control of
0
receive path
1 Frequency control of howler tone
— Read of the key scanning data
WR
Write signal for internal control registers.
Data on the data bus is written into the registers at the rising edge of WR under the condition of
digital "0" of CE (Chip Enable). While CE is in digital "1" state, WR becomes invalid. The Write
cycle is a minimum of 2 ms, but if the CK64 and CK8 signals are silent, the write cycle requires
a minimum of 50 ms.
A minimum of 2 ms specified as the write cycle is valid 10 ms after CK64 and CK8 signals are input.
RD
Read signal input to read PI0 to PI7 out of the processor.
When CE and RD are in digital "0" state, the digital values on PI0 to PI7 are output onto the data
buses DB0 to DB7. While CE is in digital "1" state, the RD signal becomes invalid.
12/43