GMS81C2012/GMS81C2020
17. Power Saving Mode
HYUNDAI MicroElectronics
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.
Wake-up Timer Mode
Peripheral
STOP Mode
Sub-active Mode
Stand-by Mode
Retain
Watch Mode
Retain
RAM
Control Registers
I/O Ports
Retain
Retain
Retain
Stop
Retain
Retain
Retain
Retain
Retain
Retain
Retain
CPU
Operation
Operation
Stop
Stop
Stop
Timer0
Stop
Operation
Oscillation
Stop
Operation
Stop
Oscillation
Sub Oscillation
Prescaler
Stop
Stop
Oscillation
Operation
Oscillation
÷ 2048 only
Stop
÷ 2048 only
Entering Condition
[WAKEUP]
0
0
1
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
Wake-up Timer Mode
Sub-active
Release Source
STOP Mode
Mode
Stand-by Mode
Watch Mode
RESET
RCWDT
EXT.INT0
EXT.INT1
Timer0
O
O
O
O
O
O
O
O
O
X
O
X
O
O
O
O
Table 17-2 Release Sources from Power Saving Mode
78
MAR. 2000 Ver 1.00
HYNIX [ HYNIX SEMICONDUCTOR ]
