ymf795 Yamatake Corporation, ymf795 Datasheet - Page 21

• Manufacturer Part Number: ymf795
• Description: Apl-2 Automobile Sound Player-2
• Manufacturer: Yamatake Corporation

YMF795
■Power-down control division diagram
■Explanation of each bit
DP0
AP1
AP2
Power-down of the LSI can be controlled for each divided internal function.
The power-down is controlled by Index 38h.
This is the bit to power off the whole digital section.
Consumption current of the digital part can be minimized because internal clock stops.
Contents of the registers are held but data in the FIFO are cleared.
This is the bit to power off the VREF circuit.
If AP1 is set to “1”, the whole analog section stops. Because an analog center voltage is made by VREF circuit.
This is the bit to power off the FM volume section, EQ circuit, speaker volume, and non-inverted amplifier side of
speaker output section.
SYNC
SCLK
SDIN
/IRQ
/RST
Serial
I/F
16b × 32w
Register
FIFO
RAM
Controlled by
using DP bit
Timing Generator
Simultaneous
Synthesizer
Controlled by
using AP1 bit
Generation
Sound
4-tone
FM
-21-
DAC
Controlled by
using AP3 bit
32-step
VOL
VREF
VREF
Controlled by
using AP4 bit
VOL
32-step
32-step
VOL
SPVSS
AMP
EQ
Controlled by
using AP2 bit
EQ1
SPOUT1
SPOUT2
EQ2
EQ3