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GMS81C5108
JUNE 2001 Ver 1.0
39
10.3 Power Saving Operation
GMS81C5108 has 2 power-saving mode. In power-saving
mode, power consumption is reduced considerably that in
Battery operation Battery life can be extended a lot.
Sleep mode is entered by setting bit 0 of Sleep Mode Reg-
ister (SMR), and STOP Mode is entered by STOP instruc-
tion.
SLEEP Mode
In this mode, the internal oscillation circuits remain active.
Oscillation continues and peripherals are operate normally
but CPU stops. Movement of all Peripherals is shown in
Table 10-1. Sleep mode is entered by setting bit 0 of SMR
(address 0DE
H
).
It is released by RESET or interrupt. To be released by in-
terrupt, interrupt should be enabled before Sleep mode.
Figure 10-5 SLEEP Mode Register
Figure 10-6 Sleep Mode Release Timing by External Interrupt
.
Figure 10-7 SLEEP Mode Release Timing by RESET pin
Sleep Mode Register
SMR
ADDRESS : 0DE
H
RESET VALUE : -------0
B
0: Release Sleep Mode
1: Enter Sleep Mode
-
-
-
-
-
-
-
Oscillator
Normal Operation
Stand-by Mode
Normal Operation
Interrupt
Internal CPU Clock
Release
Set bit 0 of SMR
(X
IN
or SX
IN
pin)
~~
~~
Oscillator
(X
IN
or SX
IN
pin)
0
BIT Counter
1
FE
FF
0
1
2
~~
t
ST
= 62.5ms
~~
~~
RESET
Internal CPU Clock
Clear & Start
~~
~~
Normal Operation
Stand-by Mode
Normal Operation
Release
Set bit 0 of SMR
~~
~~
~~
at 4.19MHz by hardware
~~
2
t
ST
=
x 256
f
MAIN
÷
1024
1
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