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[AK4675]
MS0963-E-00
2008/05
- 125 -
ミ
PCM I/F Master Mode/Slave Mode
The PLLBT2 bit selects either master or slave mode (
). When either PCM I/F A or PCM I/F B is set in slave
mode, the other is set in master mode. (For example, when PCM I/F B is set in slave mode, PCM I/F A is set in master
mode.) When the AK4675 is power-down mode (PDN pin = “L”) or PMPCM bit = “0”, each clock pins (SYNCA,
BICKA, SYNCB, BICKB) of PCM I/F become a Hi-Z (
PLLBT3-0 bits should be set when PMPCM bit = “0” to avoid shorting out of the slave mode clock pins and master mode
clock output.
After setting the PDN pin = “H”, the PCM I/F clock pins are the Hi-Z state until PMPCM bit becomes “1”. The PCM I/F
clock pins of master mode should be pulled-down or pulled-up by the resistor (about 100k
Ω
) externally to avoid the
floating state.
PLLBT2 bit
PCM I/F A
SYNCA, BICKA pins
PCM I/F B
SYNCB, BICKB pins
0
Slave Mode
Input
Master Mode
Output
(default)
1
Master Mode
Output
Slave Mode
Input
Table 99. Select PCM I/F Master/Slave Mode
PDN pin
PMPCM bit
SYNCA, BICKA pin
SYNCB, BICKB pin
L -
Hi-Z
Hi-Z
0 Hi-Z
Hi-Z
H
1
I/O Select by PLLBT2 bit
)
I/O Select by PLLBT2 bit
(
)
Table 100. PCM I/F Clock I/O State