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PIC18F258-E/LSQTP Datasheet(PDF) 319 Page - Microchip Technology |
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PIC18F258-E/LSQTP Datasheet(HTML) 319 Page - Microchip Technology |
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319 / 402 page ![]() © 2006 Microchip Technology Inc. DS41159E-page 317 PIC18FXX8 SUBLW Subtract W from Literal Syntax: [ label ]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 0x02 Before Instruction W= 1 C= ? After Instruction W= 1 C = 1 ; result is positive Z= 0 N= 0 Example 2: SUBLW 0x02 Before Instruction W= 2 C= ? After Instruction W= 0 C = 1 ; result is zero Z= 1 N= 0 Example 3: SUBLW 0x02 Before Instruction W= 3 C= ? After Instruction W = FF ; (2’s complement) C = 0 ; result is negative Z= 0 N= 1 SUBWF Subtract W from f Syntax: [ label ] 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 will be selected, overriding the BSR value. If ‘a’ is ‘1’, then the bank will be selected as per the BSR value (default). Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register ‘f’ Process Data Write to destination Example 1: SUBWF REG 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, W 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 Before Instruction REG = 0x01 W = 0x02 C= ? After Instruction REG = 0xFFh ;(2’s complement) W = 0x02 C = 0x00 ; result is negative Z = 0x00 N = 0x01 |
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