S3F80JB

RESET

 

 

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

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

MAIN:

NOP

 

 

 

 

 

 

 

 

 

 

 

 

CALL

ENTER_STOP ; Enter the STOP mode

 

 

 

 

 

 

 

 

 

 

LD

BTCON,#02H

; Clear basic timer counter.

 

JP

T,MAIN

 

8-11

Page 229
Image 229
Samsung S3F80JB manual Programming TIP To Enter Stop Mode