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MSM7584D Datasheet(PDF) 53 Page - OKI electronic componets

No. de pieza MSM7584D
Descripción Electrónicos  pi/4 Shift QPSK MODEM/ADPCM CODEC
Download  58 Pages
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Fabricante Electrónico  OKI [OKI electronic componets]
Página de inicio  http://www.oki.com
Logo OKI - OKI electronic componets

MSM7584D Datasheet(HTML) 53 Page - OKI electronic componets

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¡ Semiconductor
MSM7584D
53/58
FEDL7584D-02
METHODS OF RECORDING AND PLAYBACK
Recording Method (See the flow chart in Figure 18)
(1) • Set up the connection between the serial register/
voice ROM and ADPCM transmit-receive
system. (See Figure 20) (CR5 - B7)
• Specify the serial register/voice ROM. (CR5 -
B6)
• Set the external capacity. (CR5 - B5)
• Set the NOP command. (CR5 - B1 = "0", B0 = "0")
(2) • Set the start/stop address. (CR8 to CR12)
(3) • Set the channel. (CR13 - B7 to B3)
• Set the ADWT (address write) instruction. (CR13
- B1 = "0", B0 = "1")
(4) • The start/stop address of the channel set by the
ADWT instruction is stored in the channel index
area. When status register BUSY (CR7 - B1)
changes from "1" to "0", storage is complete.
(5) • Start recording by setting the REC (recording)
command (CR5 - B1 = "1", B0 = "0").
(6) • Check the recording start with the status register
RPM bit (CR7 - B0 = "1").
(7) • To interrupt during recording, set the STOP
(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:
• Set the channel.
• Set the ADWT instruction.
• When the BUSY bit changes from "1"
to "0", settings are complete.
(8) • When the address counter reaches the
stop address, recording is complete.
Check completion of recording with
RPM bit = "0".
Recording
BUSY = 0?
RPM = 0?
N
Basic setting
Y
(1) CR5
ST, SP
address setting
(2) CR8 to 12
Channel setting
(ADWT)
(3) CR13
BUSY = 0?
N
(4) CR7
REC
(5) CR5
Recording start
RPM = 1?
N
(6) CR7
Recording start
check
STOP
RPM = 0?
N
Channel setting
(ADWT)
Y
Y
Y
BUSY = 0?
N
RPM = 0?
N
(8) CR7
Recording
completion
check
Y
Y
END
(7) CR5
Recording stop
CR13
CR7
Figure 18 Flow Chart of Recording


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