GMS81508A Datasheet, PDF (50/91 Pages) Hynix Semiconductor – USERS MANUAL

GMS81508/16
2.13.1. 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 requiring much less power
consumption. All register and RAM data are preserved.
Caution) NOP instruction have to be written more than 2 to next lines of STOP instruction.
2.13.2. STOP Mode Release
The 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.
 STOP Mode Release
Release
Factor
Release Method
RESET By RESET pin=Low level, and Device is initialized.
INT0,INT1
INT2,INT3
Serial I/O
In the state of enable flag=1 corresponding to each interrupt at
the edge.
When Serial I/O is executed by external clock, STOP mode is
released.
System Clock
Release Signal
by interrupt
RESET
STOP
 Stabilization oscillation time + 8 Cycles
STOP Mode Stabilization Oscillation Time
determined by program.
 Release Timing of STOP Mode
45