GMS81C5108 Datasheet, PDF (41/102 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C5108
Main freq. clock
(X_IN pin)
Sub freq. clock
(SX_IN pin)
Operation clock
Main-clock operation
Changed to the Sub-clock
SCMR ← XXXX XX10_B
Turn off main clock
SCMR ← XXXX XX11_B
Sub-clock operation
(a) Main active mode → Sub active mode
Main freq. clock
(X_IN pin)
Sub freq. clock
(SX_IN pin)
Operation clock
Stabilizing Time > 60ms
Sub-clock operation
Main-clock operation
Changed to the Transition
SCMR ← XXXX XX10_B
Changed to the Main-clock
SCMR ← XXXX XX00_B
or XXXX XX01_B
(b) Sub active mode → Main active mode
Figure 10-4 System Clock Switching Timing
38
JUNE 2001 Ver 1.0