SPC251A Sunplus Technology Co., Ltd., SPC251A Datasheet - Page 7

• Manufacturer Part Number: SPC251A
• Description: 256KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

6.11. Power Savings Mode
The SPC251A provides a power savings mode (Standby mode) for
those applications that require very low stand-by current.
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
CPU
Reset
Sleep
), Tw ≧ 65536 x T1
T1
Wake-up
To
FIG. 1
T w
7
awakened.
SPC251A. After the SPC251A 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 (FIG.1).
Port IOD7-0 is the only wake-up source in the
SPC251A
SEP. 10, 2001
Version: 1.7