msm7584c Oki Semiconductor, msm7584c Datasheet - Page 53

• Manufacturer Part Number: msm7584c
• Description: Pi /4 Shift Qpsk Modem/adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
METHODS OF RECORDING AND PLAYBACK
Recording Method (See the flow chart in Figure 18)
(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
• 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 20) (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").
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".
N
N
Figure 18 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 = 0?
RPM = 1?
RPM = 0?
Recording
(ADWT)
ST, SP
REC
END
Y
Y
Y
Y
MSM7584C
(1) CR5
(2) CR8 to 12
(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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