GMS81C7216 Datasheet, PDF (80/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
20. POWER DOWN OPERATION
The GMS81C7208/16 has two power-down modes. In power-
down mode, power consumption is reduced considerably that in
Battery operation Battery life can be extended a lot.
20.1 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 20-1.
Sleep mode is entered by setting bit 0 of SMR (address 0DE_H).
It is released by RESET or interrupt. To be release by interrupt,
interrupt should be enabled before Sleep mode.
Sleep mode is entered by setting bit 0 of sleep mode regis-
ter, and STOP mode is entered by STOP instruction.
Sleep Mode Register
SMR
ADDRESS : 0DE_H
RESET VALUE : -------0
W
0: Release Sleep Mode
1: Enter Sleep Mode
Figure 20-1 SLEEP Mode Register
Oscillator
(X_IN pin)
Internal CPU Clock
Interrupt
Set bit 0 of SMR
Normal Operation
Release
Stand-by Mode
Normal Operation
Figure 20-2 Sleep Mode Release Timing by External Interrupt
.
Oscillator
(X_IN pin)
Internal CPU Clock
RESET
Set bit 0 of SMR
Release
BIT Counter
01 2
Clear & Start
FE FF 0 1 2
Normal Operation
Sleep Mode
t_ST = 62.5ms
Normal Operation
at 4.19MHz by hardware
1
t_ST = _{fMAIN ÷1024} x 256
Figure 20-3 SLEEP Mode Release Timing by RESET Pin
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FEB. 2005 Ver 1.04