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PIC16F84A Datasheet(PDF) 57 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 57 Page - Microchip Technology |
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57 / 124 page  PIC16F8X © 1998 Microchip Technology Inc. DS30430C-page 57 BTFSS Bit Test f, Skip if Set Syntax: [ label] BTFSS f,b Operands: 0 ≤ f ≤ 127 0 ≤ b < 7 Operation: skip if (f<b>) = 1 Status Affected: None Encoding: 01 11bb bfff ffff Description: If bit 'b' in register 'f' is '0' then the next instruction is executed. If bit 'b' is '1', 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 FALSE if FLAG<1> = 1, PC = address TRUE CALL Call Subroutine Syntax: [ label ] CALL k Operands: 0 ≤ k ≤ 2047 Operation: (PC)+ 1 → TOS, k → PC<10:0>, (PCLATH<4:3>) → PC<12:11> Status Affected: None Encoding: 10 0kkk kkkk kkkk Description: Call Subroutine. First, return address (PC+1) is pushed onto the stack. The eleven bit immediate address is loaded into PC bits <10:0>. The upper bits of the PC are loaded from PCLATH. CALL is a two cycle instruction. Words: 1 Cycles: 2 Q Cycle Activity: Q1 Q2 Q3 Q4 1st Cycle Decode Read literal 'k', Push PC to Stack Process data Write to PC 2nd Cycle No-Opera tion No-Opera tion No-Opera tion No-Operat ion Example HERE CALL THERE Before Instruction PC = Address HERE After Instruction PC = Address THERE TOS = Address HERE+1 |
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