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PIC16F84A Datasheet(PDF) 56 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 56 Page - Microchip Technology |
56 / 124 page ![]() PIC16F8X DS30430C-page 56 © 1998 Microchip Technology Inc. BCF Bit Clear f Syntax: [ label] BCF f,b Operands: 0 ≤ f ≤ 127 0 ≤ b ≤ 7 Operation: 0 → (f<b>) Status Affected: None Encoding: 01 00bb bfff ffff Description: Bit 'b' in register 'f' is cleared . Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write register 'f' Example BCF FLAG_REG, 7 Before Instruction FLAG_REG = 0xC7 After Instruction FLAG_REG = 0x47 BSF Bit Set f Syntax: [ label] BSF f,b Operands: 0 ≤ f ≤ 127 0 ≤ b ≤ 7 Operation: 1 → (f<b>) Status Affected: None Encoding: 01 01bb bfff ffff Description: Bit 'b' in register 'f' is set. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write register 'f' Example BSF FLAG_REG, 7 Before Instruction FLAG_REG = 0x0A After Instruction FLAG_REG = 0x8A BTFSC Bit Test, Skip if Clear Syntax: [ label] BTFSC f,b Operands: 0 ≤ f ≤ 127 0 ≤ b ≤ 7 Operation: skip if (f<b>) = 0 Status Affected: None Encoding: 01 10bb bfff ffff Description: If bit 'b' in register 'f' is '1' then the next instruction is executed. If bit 'b', in register 'f', is '0' then the next instruction is discarded, and a NOP is executed instead, making this a 2TCY instruction . Words: 1 Cycles: 1(2) Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data No-Operat ion If Skip: (2nd Cycle) Q1 Q2 Q3 Q4 No-Operat ion No-Operati on No-Opera tion No-Operat ion Example HERE FALSE TRUE BTFSC GOTO • • • FLAG,1 PROCESS_CODE Before Instruction PC = address HERE After Instruction if FLAG<1> = 0, PC = address TRUE if FLAG<1>=1, PC = address FALSE |
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