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PIC16F84A Datasheet(PDF) 59 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 59 Page - Microchip Technology |
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59 / 124 page  PIC16F8X © 1998 Microchip Technology Inc. DS30430C-page 59 COMF Complement f Syntax: [ label ] COMF f,d Operands: 0 ≤ f ≤ 127 d ∈ [0,1] Operation: (f) → (destination) Status Affected: Z Encoding: 00 1001 dfff ffff Description: The contents of register 'f' are comple- mented. If 'd' is 0 the result is stored in W. If 'd' is 1 the result is stored back in register 'f'. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write to destination Example COMF REG1,0 Before Instruction REG1 = 0x13 After Instruction REG1 = 0x13 W = 0xEC DECF Decrement f Syntax: [ label] DECF f,d Operands: 0 ≤ f ≤ 127 d ∈ [0,1] Operation: (f) - 1 → (destination) Status Affected: Z Encoding: 00 0011 dfff ffff Description: Decrement register 'f'. If 'd' is 0 the result is stored in the W register. If 'd' is 1 the result is stored back in register 'f' . Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write to destination Example DECF CNT, 1 Before Instruction CNT = 0x01 Z = 0 After Instruction CNT = 0x00 Z = 1 DECFSZ Decrement f, Skip if 0 Syntax: [ label ] DECFSZ f,d Operands: 0 ≤ f ≤ 127 d ∈ [0,1] Operation: (f) - 1 → (destination); skip if result = 0 Status Affected: None Encoding: 00 1011 dfff ffff Description: The contents of register 'f' are decre- mented. If 'd' is 0 the result is placed in the W register. If 'd' is 1 the result is placed back in register 'f'. If the result is 1, the next instruction, is executed. If the result is 0, then a NOP is executed instead making it a 2TCY instruc- tion. Words: 1 Cycles: 1(2) Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write to destination If Skip: (2nd Cycle) Q1 Q2 Q3 Q4 No-Operat ion No-Opera tion No-Operat ion No-Operati on Example HERE DECFSZ CNT, 1 GOTO LOOP CONTINUE • • • Before Instruction PC = address HERE After Instruction CNT = CNT - 1 if CNT = 0, PC = address CONTINUE if CNT ≠ 0, PC = address HERE+1 |
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