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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT46R46 数据表(PDF) 33 Page - Holtek Semiconductor Inc |
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HT46R46 数据表(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 42 page  RRCA [m] Rotate right through carry and place result in the accumulator Description Data of the specified data memory and the carry flag are rotated 1 bit right. Bit 0 replaces the carry bit and the original carry flag is rotated into the bit 7 position. The rotated result is stored in the accumulator. The contents of the data memory remain unchanged. Operation ACC.i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6) ACC.7 ¬ C C ¬ [m].0 Affected flag(s) TO PDF OV Z AC C ¾¾¾¾¾ Ö SBC A,[m] Subtract data memory and carry from the accumulator Description The contents of the specified data memory and the complement of the carry flag are sub- tracted from the accumulator, leaving the result in the accumulator. Operation ACC ¬ ACC+[m]+C Affected flag(s) TO PDF OV Z AC C ¾ ¾ ÖÖÖÖ SBCM A,[m] Subtract data memory and carry from the accumulator Description The contents of the specified data memory and the complement of the carry flag are sub- tracted from the accumulator, leaving the result in the data memory. Operation [m] ¬ ACC+[m]+C Affected flag(s) TO PDF OV Z AC C ¾ ¾ ÖÖÖÖ SDZ [m] Skip if decrement data memory is 0 Description The contents of the specified data memory are decremented by 1. If the result is 0, the next instruction is skipped. If the result is 0, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruc- tion (2 cycles). Otherwise proceed with the next instruction (1 cycle). Operation Skip if ([m] -1)=0, [m] ¬ ([m]-1) Affected flag(s) TO PDF OV Z AC C ¾¾¾¾¾¾ SDZA [m] Decrement data memory and place result in ACC, skip if 0 Description The contents of the specified data memory are decremented by 1. If the result is 0, the next instruction is skipped. The result is stored in the accumulator but the data memory remains unchanged. If the result is 0, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cy- cles). Otherwise proceed with the next instruction (1 cycle). Operation Skip if ([m] -1)=0, ACC ¬ ([m]-1) Affected flag(s) TO PDF OV Z AC C ¾¾¾¾¾¾ HT46R46/HT46C46/HT46R47/HT46C47 Rev. 1.00 33 December 28, 2004 |
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