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PIC18F258-E/LSQTP Datasheet(PDF) 310 Page - Microchip Technology |
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PIC18F258-E/LSQTP Datasheet(HTML) 310 Page - Microchip Technology |
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310 / 402 page  PIC18FXX8 DS41159E-page 308 © 2006 Microchip Technology Inc. MULLW Multiply Literal with W Syntax: [ label ] MULLW k Operands: 0 ≤ k ≤ 255 Operation: (W) x k → PRODH:PRODL Status Affected: None Encoding: 0000 1101 kkkk kkkk Description: An unsigned multiplication is carried out between the contents of W and the 8-bit literal ‘k’. The 16-bit result is placed in the PRODH:PRODL register pair. PRODH contains the high byte. W is unchanged. None of the status flags are affected. Note that neither Overflow nor Carry is possible in this operation. A Zero result is possible but not detected. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read literal ‘k’ Process Data Write registers PRODH: PRODL Example: MULLW 0xC4 Before Instruction W= 0xE2 PRODH = ? PRODL = ? After Instruction W= 0xE2 PRODH = 0xAD PRODL = 0x08 MULWF Multiply W with f Syntax: [ label ] MULWF f [,a] Operands: 0 ≤ f ≤ 255 a ∈ [0,1] Operation: (W) x (f) → PRODH:PRODL Status Affected: None Encoding: 0000 001a ffff ffff Description: An unsigned multiplication is carried out between the contents of W and the register file location ‘f’. The 16-bit result is stored in the PRODH:PRODL register pair. PRODH contains the high byte. Both W and ‘f’ are unchanged. None of the status flags are affected. Note that neither Overflow nor Carry is possible in this operation. A Zero result is possible but not detected. If ‘a’ is ‘0’, the Access Bank will be selected, overriding the BSR value. If ‘a’= 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 registers PRODH: PRODL Example: MULWF REG Before Instruction W= 0xC4 REG = 0xB5 PRODH = ? PRODL = ? After Instruction W= 0xC4 REG = 0xB5 PRODH = 0x8A PRODL = 0x94 |
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