Samsung S3F80JB - Manual (Page 229)

S3F80JB RESET
8-11
STOP MODE
STOP mode is invoked by executing the instruction ‘STOP’, after setting the stop control register (STOPCON). In
STOP mode, the operation of the CPU and all peripherals is halted. That is, the on-chip main oscillator stops and
the current consumption can be reduced. All system functions stop when the clock "freezes," but data stored in
the internal register file is retained. STOP mode can be released in one of two ways: by a system reset or by an
external interrupt. After releasing from STOP mode, the value of stop control register (STOPCON) is cleared
automatically.
PROGRAMMING TIP – To Enter STOP Mode
This example shows how to enter the stop mode.
ORG 0000H Reset address
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JP T, START
ENTER_STOP:
LD STOPCON, #0A5H
STOP
NOP
NOP
NOP
RET
ORG 0100H-3
JP T, START
ORG 0100H ; Reset address
START: LD BTCON, #03 ; Clear basic timer counter.
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MAIN: NOP
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CALL ENTER_STOP ; Enter the STOP mode
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LD BTCON,#02H ; Clear basic timer counter.
JP T,MAIN
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