msm7708-02 Oki Semiconductor, msm7708-02 Datasheet - Page 35

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

¡ Semiconductor
Playback Method (See the flow chart in Figure 10.)
(1) • Set up the connection between
(2) • Set the channel. (CR13 - B7 to
(3) • For playback of the voice ROM,
(4) • The start/stop address of the
(5) • Start playback by setting the
(6) • Check the playback start with
(7) • To stop playback set the STOP
(8) • When the address counter
Note: If the stop address value is
• Specify the serial register/voice
• Set the external capacity. (CR5 -
• Set the NOP command. (CR5 -
• Set the ADRD (address read)
the serial register/voice ROM
and ADPCM transmit-receive
system. (See Figure 11.) (CR5 -
B7)
ROM. (CR5 - B6)
B5)
B1 = "0", B0 = "0")
B3)
instruction. (CR13 - B1 = "1", B0
= "0")
set the start/stop address here.
channel set by the ADRD
instruction is fetched from the
channel index area.
When status register BUSY (CR7
- B1) changes from "1" to "0",
fetching is complete.
PLAY (playback) command
(CR5 - B1 = "0", B0 = "1"). In this
case, basic setting of CR5 - B7 to
B5 should be the same as (1).
the status register RPM bit (CR7
- B0 = "1").
(stop) command (CR5 - B1 = "1",
B0 = "1").
reaches the stop address,
playback is complete.
Check completion of playback
with RPM bit = "0".
smaller than the start address
value, playback is made to the
last address of the serial
register.
address setting
ST, SP
Voice ROM
STOP
Figure 10 Flow Chart of Playback
N
N
N
N
Channel setting
Basic setting
BUSY = 0?
BUSY = 0?
RPM = 0?
RPM = 1?
RPM = 1?
Playback
(ADRD)
PLAY
END
Y
Y
Y
Y
(1) CR5
(2) CR13
(3) CR8 to 12
(4) CR7
(5) CR5
Playback start
(6) CR7
Playback start
check
(7) CR5
Playback stop
(8) CR7
Playback completion
check
MSM7708-02
35/38