GMS81C2112 Datasheet, PDF (78/107 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C2112/GMS81C2120
17. Power Saving Mode
For applications where power consumption is a critical
factor, device provides four kinds of power saving func-
tions, STOP mode, Sub-active mode and Wake-up Timer
mode (Stand-by mode, Watch mode). Table 17-1 shows
the status of each Power Saving Mode.
Peripheral
STOP Mode
RAM
Control Registers
I/O Ports
CPU
Timer0
Oscillation
Prescaler
Entering Condition
[WAKEUP]
Retain
Retain
Retain
Stop
Stop
Stop
Stop
0
Wake-up Timer
Mode
Stand-by Mode
Retain
Retain
Retain
Stop
Operation
Oscillation
÷ 2048 only
1
Table 17-1 Power Saving Mode
The power saving function is activated by execution of
STOP instruction and by execution of STOP instruction af-
ter setting the corresponding status (WAKEUP) of
CKCTLR. We shows the release sources from each Power
Saving Mode
Release Source
RESET
RCWDT
EXT.INT0
EXT.INT1
Timer0
STOP Mode
O
O
Wake-up Timer
Mode
Stand-by Mode
O
O
O
O
X
O
Table 17-2 Release Sources from Power Saving Mode
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JUNE. 2001 Ver 1.00