GMS84512 Datasheet, PDF (87/123 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTER

GMS 84512 / 84524
4.2.1 STOP Mode
STOP Mode can be entered by STOP instruction during program execution. In STOP mode, oscillator is
stopped to make all clocks stop, which leads to the mode requring much less power consumption. All
register and RAM data are preserved.
4.2.2 STOP Mode Release
Release of STOP mode is done by reset input or interrupt. When there is a release signal of STOP
mode, the instruction execution is started after stabilization oscillation time set by program. After releasing
STOP mode, instruction execution is different by I-Flag(bit 2 of PSW)
If I-Flag = “1” entered Interrupt Service Routine,
If I-Flag = “0” execute program from next instruction of STOP instruction.
TABLE 4.2.1 STOP Mode Release
Release
Factor
RESET
Release Method
By RESET pin=Low level, and Device is initialzed.
STOP
INT1,INT2
INT3,
V-sync
Serial I/O
( IFSIO )
In the state of enable flag=1 corrosponding to each interrupt at
the edge.
When SE="1" and serial I/O is executing by external clock,
interrupt occurs by serial I/O operation completed
l Release Timing of STOP Mode
STOP
System Clock
Release Signal
by interrupt
RESET
Stabilization oscillation time + 8 Cycles ¡è
STOP Mode Stabilization Oscillation Time
determined by program.
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