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STC89LE53RC 数据表(PDF) 73 Page - STCmicro Technology Co,.Ltd |
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STC89LE53RC 数据表(HTML) 73 Page - STCmicro Technology Co,.Ltd |
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73 / 165 page  SETB <bit> Function: Set bit Description: SETB sets the indicated bit to one. SETB can operate on the carry flag or any directly addressable bit. No other flags are affected Example: The carry flag is cleared. Output Port 1 has been written with the value 34H (00110100B). The instructions, SETB C SETB P1.0 will leave the carry flag set to 1 and change the data output on Port 1 to 35H (00110101B). SETB C Bytes: 1 Cycles: 1 Encoding: 1 1 0 1 0 0 1 1 Operation: SETB (C) ← 1 ← 11 SETB bit Bytes: 2 Cycles: 1 Encoding: 1 1 0 1 0 0 1 0 bit address Operation: SETB (bit) ← 1 ← 11 SJMP rel Function: Short Jump Description: Program control branches unconditionally to the address indicated. The branch destination is computed by adding the signed displacement in the second instruction byte to the PC, after incrementing the PC twice. Therefore, the range of destinations allowed is from 128bytes preceding this instruction to 127 bytes following it. Example: The label “RELADR” is assigned to an instruction at program memory location 0123H. The instruction, SJMP RELADR will assemble into location 0100H. After the instruction is executed, the PC will contain the value 0123H. (Note: Under the above conditions the instruction following SJMP will be at 102H.Therefore, the displacement byte of the instruction will be the relative offset (0123H - 0102H) = 21H. Put another way, an SJMP with a displacement of 0FEH would be an one-instruction infinite loop). Bytes: 2 Cycles: 2 Encoding: 1 0 0 0 0 0 0 0 rel. address Operation: SJMP ( PC) ← (PC)+2 ← (PC)+2 (PC)+2 (PC) ← (PC)+rel ← (PC)+rel (PC)+rel 73 |
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