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S3C72G9 Datasheet(PDF) 81 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 81 Page - Samsung semiconductor |
81 / 96 page ![]() '-!(!%2-4!%-' RET Operation: Operand Operation Summary Bytes Cycles – Return from subroutine 1 3 Description: RET pops the PC values successively from the stack, incrementing the stack pointer by six. Program execution continues from the resulting address, generally the instruction immediately following a CALL, LCALL or CALLS. Operand Binary Code Operation Notation – 1 1 0 0 0 1 0 1 PC14-8 ← (SP+1) (SP) PC7-0 ← (SP+3) (SP+2) EMB,ERB ← (SP+5) (SP+4) SP ← SP+6 Example: The stack pointer contains the value 0FAH. RAM locations 0FAH, 0FBH, 0FCH, and 0FDH contain 1H, 0H, 5H, and 2H, respectively. The instruction RET leaves the stack pointer with the new value of 00H and program execution continues from location 0125H. During a return from subroutine, PC values are popped from stack locations as follows: SP → (0FAH) PC11 - PC8 SP + 1 (0FBH) 0 PC14 PC13 PC12 SP + 2 (0FCH) PC3 - PC0 SP + 3 (0FDH) PC7 - PC4 SP + 4 (0FEH) 0 0 EMB ERB SP + 5 (0FFH) 0 0 0 0 SP + 6 (000H) |
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