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S3C72G9 Datasheet(PDF) 3 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 3 Page - Samsung semiconductor |
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3 / 96 page  REDUCING INSTRUCTION REDUNDANCY When redundant instructions such as LD A,#im and LD EA,#imm are used consecutively in a program sequence, only the first instruction is executed. The redundant instructions which follow are ignored, that is, they are handled like a NOP instruction. When LD HL,#imm instructions are used consecutively, redundant instructions are also ignored. In the following example, only the 'LD A, #im' instruction will be executed. The 8-bit load instruction which follows it is interpreted as redundant and is ignored: LD A,#im ; Load 4-bit immediate data (#im) to accumulator LD EA,#imm ; Load 8-bit immediate data (#imm) to extended ; accumulator In this example, the statements 'LD A,#2H' and 'LD A,#3H' are ignored: BITR EMB LD A,#1H ; Execute instruction LD A,#2H ; Ignore, redundant instruction LD A,#3H ; Ignore, redundant instruction LD 23H,A ; Execute instruction, 023H ← #1H If consecutive LD HL, #imm instructions (load 8-bit immediate data to the 8-bit memory pointer pair, HL) are detected, only the first LD is executed and the LDs which immediately follow are ignored. For example, LD HL,#10H ; HL ← 10H LD HL,#20H ; Ignore, redundant instruction LD A,#3H ; A ← 3H LD EA,#35H ; Ignore, redundant instruction LD @HL,A ; (10H) ← 3H If an instruction reference with a REF instruction has a redundancy effect, the following conditions apply: — If the instruction preceding the REF has a redundancy effect, this effect is cancelled and the referenced instruction is not skipped. — If the instruction following the REF has a redundancy effect, the instruction following the REF is skipped. PROGRAMMING TIP — Example of the Instruction Redundancy Effect ORG 0020H ABC LD EA,#30H ; Stored in REF instruction reference area ORG 0080H LD EA,#40H ; Redundancy effect is encountered REF ABC ; No skip (EA ← #30H) REF ABC ; EA ← #30H LD EA,#50H ; Skip |
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