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PIC18F1220E/SSSQTP Datasheet(PDF) 203 Page - Microchip Technology |
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PIC18F1220E/SSSQTP Datasheet(HTML) 203 Page - Microchip Technology |
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203 / 308 page  © 2007 Microchip Technology Inc. DS39605F-page 201 PIC18F1220/1320 BNC Branch if Not Carry Syntax: [ label ] BNC n Operands: -128 ≤ n ≤ 127 Operation: if Carry bit is ‘0’ (PC) + 2 + 2n → PC Status Affected: None Encoding: 1110 0011 nnnn nnnn Description: If the Carry bit is ‘0’, then the program will branch. The 2’s complement number ‘2n’ is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction. Words: 1 Cycles: 1(2) Q Cycle Activity: If Jump: Q1 Q2 Q3 Q4 Decode Read literal ‘n’ Process Data Write to PC No operation No operation No operation No operation If No Jump: Q1 Q2 Q3 Q4 Decode Read literal ‘n’ Process Data No operation Example: HERE BNC Jump Before Instruction PC = address (HERE) After Instruction If Carry = 0; PC = address (Jump) If Carry = 1; PC = address (HERE + 2) BNN Branch if Not Negative Syntax: [ label ] BNN n Operands: -128 ≤ n ≤ 127 Operation: if Negative bit is ‘0’ (PC) + 2 + 2n → PC Status Affected: None Encoding: 1110 0111 nnnn nnnn Description: If the Negative bit is ‘0’, then the program will branch. The 2’s complement number ‘2n’ is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction. Words: 1 Cycles: 1(2) Q Cycle Activity: If Jump: Q1 Q2 Q3 Q4 Decode Read literal ‘n’ Process Data Write to PC No operation No operation No operation No operation If No Jump: Q1 Q2 Q3 Q4 Decode Read literal ‘n’ Process Data No operation Example: HERE BNN Jump Before Instruction PC = address (HERE) After Instruction If Negative = 0; PC = address (Jump) If Negative = 1; PC = address (HERE + 2) |
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