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PIC18F23K22-E/ML Datasheet(PDF) 403 Page - Microchip Technology |
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PIC18F23K22-E/ML Datasheet(HTML) 403 Page - Microchip Technology |
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403 / 492 page ![]() 2010 Microchip Technology Inc. Preliminary DS41412B-page 403 PIC18(L)F2X/4XK22 SUBLW Subtract W from literal Syntax: SUBLW k Operands: 0 k 255 Operation: k – (W) W Status Affected: N, OV, C, DC, Z Encoding: 0000 1000 kkkk kkkk Description W is subtracted from the eight-bit literal ‘k’. The result is placed in W. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read literal ‘k’ Process Data Write to W Example 1: SUBLW 02h Before Instruction W = 01h C= ? After Instruction W = 01h C = 1 ; result is positive Z= 0 N= 0 Example 2: SUBLW 02h Before Instruction W = 02h C= ? After Instruction W = 00h C = 1 ; result is zero Z= 1 N= 0 Example 3: SUBLW 02h Before Instruction W = 03h C= ? After Instruction W = FFh ; (2’s complement) C = 0 ; result is negative Z= 0 N= 1 SUBWF Subtract W from f Syntax: SUBWF f {,d {,a}} Operands: 0 f 255 d [0,1] a [0,1] Operation: (f) – (W) dest Status Affected: N, OV, C, DC, Z Encoding: 0101 11da ffff ffff Description: Subtract W from register ‘f’ (2’s complement method). If ‘d’ is ‘0’, the result is stored in W. If ‘d’ is ‘1’, the result is stored back in register ‘f’ (default). If ‘a’ is ‘0’, the Access Bank is selected. If ‘a’ is ‘1’, the BSR is used to select the GPR bank. If ‘a’ is ‘0’ and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 25.2.3 “Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode” for details. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register ‘f’ Process Data Write to destination Example 1: SUBWF REG, 1, 0 Before Instruction REG = 3 W= 2 C= ? After Instruction REG = 1 W= 2 C = 1 ; result is positive Z= 0 N= 0 Example 2: SUBWF REG, 0, 0 Before Instruction REG = 2 W= 2 C= ? After Instruction REG = 2 W= 0 C= 1 ; result is zero Z= 1 N= 0 Example 3: SUBWF REG, 1, 0 Before Instruction REG = 1 W= 2 C= ? After Instruction REG = FFh ;(2’s complement) W= 2 C = 0 ; result is negative Z= 0 N= 1 |
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