SPC500A3 Sunplus Technology Co., Ltd., SPC500A3 Datasheet - Page 6

• Manufacturer Part Number: SPC500A3
• Description: 512KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

6.9. Power Savings Mode
The SPC500A3 provides a power savings mode (Standby mode)
for those applications that require very low stand-by current. To
enter standby mode, the Wake-Up Register should be enabled
and then stop the CPU clock by writing the STOP CLOCK
Register. The CPU will then go to the stand-by mode. In such a
mode, RAM and I/Os will remain in their previous states until being
T1 = 1 / (F
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Proprietary & Confidential
CPU CLK
Input/Output IOC port : IOC6 - 4
Input/Output IOC port : IOC3 - 0
Reset
Sleep
CPU
OD : Open Drain
OD : Open Drain
input data
input data
), Tw ≧ 65536 x T1
logic_3
logic_4
control
control
output
output
data
data
OD-NMOS
OD-NMOS
buffer or
buffer or
T1
100K
100K
VDD
VDD
Wake-up
FIG. 1
T w
6
*Values shown are for VDD = 5.0V test conditions only.
awakened.
SPC500A3. After the SPC500A3 is awakened, the internal CPU
will go to the RESET State (Tw ≧ 65536 x T1) and then continue
processing the program. Wakeup Reset will not affect RAM or
I/Os (See FIG.1).
Input/Output IOD port : IOD7 - 4
Input/Output IOD port : IOD3 - 0
OD : Open Drain
OD : Open Drain
input data
input data
Port IOD7 - 0 is the only wake-up source in the
logic_6
logic_5
control
control
output
output
data
data
OD-PMOS
OD-PMOS
or buffer
or buffer
SPC500A3
70K
70K
JUL. 30, 2001
Version: 1.0