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S3C72G9 Datasheet(PDF) 60 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 60 Page - Samsung semiconductor |
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60 / 96 page  5-2$') &'0'!" %! 1 JR (Continued) Examples: 1. A short form for a relative jump to label 'KK' is the instruction JR KK where 'KK' must be within the allowed range of current PC-15 to current PC+16. The JR instruction has in this case the effect of an unconditional JP instruction. 2. In the following instruction sequence, if the instruction 'LD WX, #02H' were to be executed in place of 'LD WX,#00H', the program would jump to 1004H and 'JPS CCC' would be executed. If 'LD WX,#03H' were to be executed, the jump would be to1006H and 'JPS DDD' would be executed. ORG 1000H JPS AAA JPS BBB JPS CCC JPS DDD XXX LD WX,#00H ; WX ← 00H LD EA,WX ADS WX,EA ; WX ← (WX) + (EA) JR @WX ; Current PC12-8 (10H) + WX (00H) = 1000H ; Jump to address 1000H and execute JPS AAA 3. Here is another example: ORG 1100H LD A,#0H LD A,#1H LD A,#2H LD A,#3H LD 30H,A ; Address 30H ← A JPS YYY XXX LD EA,#00H ; EA ← 00H JR @EA ; Jump to address 1100H ; Address 30H ← 00H If 'LD EA,#01H' were to be executed in place of 'LD EA,#00H', the program would jump to 1101H and address 30H would contain the value 1H. If 'LD EA,#02H' were to be executed, the jump would be to 1102H and address 30H would contain the value 2H. |
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