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PIC16C925-S/CL датащи(PDF) 129 Page - Microchip Technology |
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PIC16C925-S/CL датащи(HTML) 129 Page - Microchip Technology |
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129 / 182 page ![]() 2001 Microchip Technology Inc. Preliminary DS39544A-page 127 PIC16C925/926 RETURN Return from Subroutine Syntax: [ label ] RETURN Operands: None Operation: TOS → PC Status Affected: None Encoding: 00 0000 0000 1000 Description: Return from subroutine. The stack is POPed and the top of the stack (TOS) is loaded into the program counter. This is a two-cycle instruction. Words: 1 Cycles: 2 Q Cycle Activity: Q1 Q2 Q3 Q4 1st Cycle Decode No Operation No Operation Pop from the Stack 2nd Cycle No Operation No Operation No Operation No Operation Example RETURN After Interrupt: PC = TOS RLF Rotate Left f through Carry Syntax: [ label ] RLF f [,d] Operands: 0 ≤ f ≤ 127 d ∈ [0,1] Operation: See description below Status Affected: C Encoding: 00 1101 dfff ffff Description: The contents of register ’f’ are rotated one bit to the left through the Carry Flag. If ’d’ is 0, the result is placed 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 RLF REG1,0 Before Instruction: REG1 = 1110 0110 C= 0 After Instruction: REG1 = 1110 0110 W= 1100 1100 C= 1 Register f C |
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