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S3C72G9 Datasheet(PDF) 89 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 89 Page - Samsung semiconductor |
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89 / 96 page  ' -!(!%2-4!%- '# $ SRET Operation: Operand Operation Summary Bytes Cycles – Return from subroutine and skip 1 3 + S Description: SRET is normally used to return to the previously executing procedure at the end of a subroutine that was initiated by a CALL, LCALL or CALLS instruction. SRET skips the resulting address, which is generally the instruction immediately after the point at which the subroutine was called. Then, program execution continues from the resulting address and the contents of the location addressed by the stack pointer are popped into the program counter. Operand Binary Code Operation Notation – 1 1 1 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: If the stack pointer contains the value 0FAH and RAM locations 0FAH, 0FBH, 0FCH, and 0FDH contain the values 1H, 0H, 5H, and 2H, respectively, the instruction SRET leaves the stack pointer with the value 00H and the program returns to continue execution at location 0125H, then skips unconditionally. During a return from subroutine, data is popped from the stack to the PC 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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Similar Description - S3C72G9 |
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