SPC41B1 Sunplus Technology Co., Ltd., SPC41B1 Datasheet - Page 6

• Manufacturer Part Number: SPC41B1
• Description: 40KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

6.6. Power Savings Mode
The SPC41B1 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
6.7. Low Voltage Reset
The SPC41B1 includes a Low Voltage Reset (LVR) function.
Below the minimum power-supply voltage of 2.2V, the CPU
system will become unstable and malfunction.
© Sunplus Technology Co., Ltd.
Proprietary & Confidential
CPU CLK
CPU
RESET
), Tw ≧ 65536 x T1
VDD
Reset
2.2V
CPU
CLK
Sleep
T1
(The LVR function is the same as Power ON Reset or External Reset.)
T1
Wake-up
T2
Low Voltage
≧
T2
2 * T1
FIG. 1
FIG. 2
T w
6
awakened.
SPC41B1. After the SPC41B1 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).
Reset will reset all functions into the initial operational (stable)
state if the VDD power-supply voltage drops below 2.2V (FIG.2).
Port IOD7-0 is the only wake-up source in the
T
W
SPC41B1
SEP. 04, 2001
Version: 1.3