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VR4102 Datasheet(PDF) 494 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 494 Page - NEC

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CHAPTER 25 HSP (MODEM INTERFACE UNIT)
494
25.3 POWER CONTROL
Power control of the CODEC and AFE can be performed using the OPD# pin and the BSC bit (HSPINIT). The
following is an example of a control method using these units.
Figure 25-3. Block Diagram of HSP Interface Power Control
VR4102
Voltage
control unit
L: ON
H: OFF
CODEC
AFE
Telephone
line
OPD# pin
BSC bit
HSP interface
other than OPD#
(1) After RTC reset
Item
OPD# pin
BSC bit
HSP bus state
VR4102 power
CODEC/AFE
power
1
When initialized
L
0
Note
ON
OFF
2
During power-on of CODEC or AFE
H
0
Note
ON
ON
3
When HSP bus’s gate is set to “ON”
H
1
Normal
ON
ON
4
Software modem control
H
1
Normal
ON
ON
Note
Refer to 2.3 PIN STATUS UPON A SPECIFIC STATE.
(2) During power-down (VR4102: Fullspeed/Standby/Suspend mode)
Item
OPD# pin
BSC bit
HSP bus state
VR4102 power
CODEC/AFE
power
1
Operation complete
H
1
Normal
ON
ON
2
When HSP bus’s gate is set to “OFF”
H
0
Note
ON
ON
3
When CODEC or AFE power is set to
“OFF”
L0
Note
ON
OFF
4
If necessary, execute STANDBY/
SUSPEND command
L0
Note
ON
OFF
Note
Refer to 2.3 PIN STATUS UPON A SPECIFIC STATE.



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