µPD9930
(4) Power up/down command (PUPCMD/PDWCMD)
The stand-by mode is set and cleared by the following two special commands. When resetting, the stand-by
mode is set.
Figure 2-7 Power Down Command (Sets to stand-by mode)
D7
0
D6
1
D5
1
D4
1
D3
0
D2
0
D1
X
D0
X
PDWCMD
Remark X: Don't Care
Figure 2-8 Power Up Command (Clears stand-by mode)
D7
0
D6
1
D5
1
D4
1
D3
1
D2
0
D1
X
D0
X
PUPCMD
Remark X: Don't Care
Power up/down timing
Power up command
FSYNC
Power down command
COUNT
ANAPWD
CLKPWD
DSPPWD
0
1
2
3
238
239
240
241
0
0
Remarks COUNT: Internal counter (counts with an 8-kHz internal clock)
ANAPWD: Analog power down (power down when high)
CLKPWD: Clock power down (power down when high)
DSPPWD: Signal processing power down (power down when high)
16
NEC [ NEC ]
