SPC41A Sunplus Technology Co., Ltd., SPC41A Datasheet - Page 6

• Manufacturer Part Number: SPC41A
• Description: 40KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

6.8. Power Savings Mode
The SPC41A 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
6.9. I/O Port Configuration
© Sunplus Technology Co., Ltd.
Proprietary & Confidential
Input/Output IOC port : IOC3 - 0
Input/Output IOA port : IOA3 - 0
OD : Open Drain
OD : Open Drain
CPU
CPU CLK
input data
input data
), Tw ≧65536 x T1
Reset
Sleep
logic_2
logic_1
control
control
output
output
data
data
OD-NMOS
OD-NMOS
buffer or
buffer or
T1
90K
VDD
VDD
90K
Wake-up
To
FIG. 1
6
T w
awakened.
SPC41A. After the SPC41A 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).
*Values shown are for VDD = 5.0V test conditions only.
Input/Output IOD port : IOD3 - 0
Input/Output IOD port : IOD7 - 4
OD : Open Drain
OD : Open Drain
input data
input data
Port IOD7-0 is the only wake-up source in the
logic_3
control
logic_4
control
output
output
data
data
OD-PMOS
OD-PMOS
or buffer
or buffer
SPC41A
60K
60K
SEP. 04, 2001
Version: 1.8