msm7708-02 Oki Semiconductor, msm7708-02 Datasheet - Page 34

• Manufacturer Part Number: msm7708-02
• Description: Serial Register Interface Adpcm Codec For Telephone Recording
• Manufacturer: Oki Semiconductor

¡ Semiconductor
METHODS OF RECORDING AND PLAYBACK
Recording Method (See the flow chart in Figure 9.)
(1) • Set up the connection between the serial register/
(2) • Set the start/stop address. (CR8 to CR12)
(3) • Set the channel. (CR13 - B7 to B3)
(4) • The start/stop address of the channel set by the
(5) • Start recording by setting the REC (recording)
(6) • Check the recording start with the status register
(7) • To interrupt during recording, set the STOP
(8) • When the address counter reaches the
Note: If the stop address value is smaller
• Specify the serial register/voice ROM. (CR5 -
• Set the external capacity. (CR5 - B5)
• Set the NOP command. (CR5 - B1 = "0", B0 = "0")
• Set the ADWT (address write) instruction. (CR13
• Set the channel.
• Set the ADWT instruction.
• When the BUSY bit changes from "1"
voice ROM and ADPCM transmit-receive
system. (See Figure 11.) (CR5 - B7)
B6)
- B1 = "0", B0 = "1")
ADWT instruction is stored in the channel index
area. When status register BUSY (CR7 - B1)
changes from "1" to "0", storage is complete.
command (CR5 - B1 = "1", B0 = "0"). In this case,
the basic setting of CR5 - B7 to B5 should be the
same as (1).
RPM bit (CR7 - B0 = "1").
(stop) command (CR5 - B1 = "1", B0 = "1").
In this case, to store the address counter contents
in the channel index area as a new stop address,
the following settings are required:
to "0", settings are complete.
stop address, recording is complete.
Check completion of recording with
RPM bit = "0".
than the start address value,
recording is made to the last address
of the serial register.
N
N
Figure 9 Flow Chart of Recording
Channel setting
BUSY = 0?
RPM = 0?
(ADWT)
STOP
Y
Y
N
N
N
N
Channel setting
address setting
Basic setting
BUSY = 0?
BUSY = 0?
RPM = 1?
RPM = 0?
RPM = 0?
Recording
(ADWT)
ST, SP
REC
END
Y
Y
Y
Y
MSM7708-02
(1) CR5
(2) CR8 to CR12
(3) CR13
(4) CR7
(5) CR5
Recording start
(6) CR7
Recording start
check
(7) CR5
Recording stop
CR13
CR7
(8) CR7
Recording
completion
check
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