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数据搜索系统，热门电子元器件搜索 |
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STC89LE53RC 数据表(PDF) 70 Page - STCmicro Technology Co,.Ltd |
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STC89LE53RC 数据表(HTML) 70 Page - STCmicro Technology Co,.Ltd |
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70 / 165 page  PUSH direct Function: Push onto stack Description: The Stack Pointer is incremented by one. The contents of the indicated variableis then copied into the internal RAM location addressed by the Stack Pointer. Otherwise no flags are affected. Example: On entering interrupt routine the Stack Pointer contains 09H. The Data Pointer holds the value 0123H. The instruction sequence, PUSH DPL PUSH DPH will leave the Stack Pointer set to 0BH and store 23H and 01H in internal RAM locations 0AH and 0BH, respectively. Bytes: 2 Cycles: 2 Encoding: 1 1 0 0 0 0 0 0 direct address Operation: PUSH (SP) ← (SP)+1 ← (SP)+1 (SP) + 1 ((SP)) ← (direct) ← (direct) (direct) RET Function: Return from subroutine Description: RET pops the high-and low-order bytes of the PC successively from the stack, decrementing the Stack Pointer by two. Program execution continues at the resulting address, generally the instruction immediately following an ACALL or LCALL. No flags are affected. Example: The Stack Pointer originally contains the value 0BH. Internal RAM locations 0AH and 0BH contain the values 23H and 01H, respectively. The instruction, RET will leave the Stack Pointer equal to the value 09H. Program execution will continue at location 0123H. Bytes: 1 Cycles: 2 Encoding: 0 0 1 0 0 0 1 0 Operation: RET (PC 15-8) ← ((SP)) ← ((SP)) ((SP)) (SP) ← (SP) -1 ← (SP) -1 (SP) -1 (PC 7-0) ← ((SP)) ← ((SP)) ((SP)) (SP) ← (SP) -1 ← (SP) -1 (SP) -1 70 |
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