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PIC16F84A Datasheet(PDF) 67 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 67 Page - Microchip Technology |
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67 / 124 page  PIC16F8X © 1998 Microchip Technology Inc. DS30430C-page 67 SUBWF Subtract W from f Syntax: [ label ] SUBWF f,d Operands: 0 ≤ f ≤ 127 d ∈ [0,1] Operation: (f) - (W) → (destination) Status Affected: C, DC, Z Encoding: 00 0010 dfff ffff Description: Subtract (2’s complement method) W reg- ister from register 'f'. If 'd' is 0 the result is stored in the W register. If 'd' is 1 the result is stored back in register 'f'. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write to destination Example 1: SUBWF REG1, 1 Before Instruction REG1 = 3 W = 2 C = ? Z = ? After Instruction REG1 = 1 W = 2 C = 1; result is positive Z = 0 Example 2: Before Instruction REG1 = 2 W = 2 C = ? Z = ? After Instruction REG1 = 0 W = 2 C = 1; result is zero Z = 1 Example 3: Before Instruction REG1 = 1 W = 2 C = ? Z = ? After Instruction REG1 = 0xFF W = 2 C = 0; result is negative Z = 0 SWAPF Swap Nibbles in f Syntax: [ label ] SWAPF f,d Operands: 0 ≤ f ≤ 127 d ∈ [0,1] Operation: (f<3:0>) → (destination<7:4>), (f<7:4>) → (destination<3:0>) Status Affected: None Encoding: 00 1110 dfff ffff Description: The upper and lower nibbles of register 'f' are exchanged. If 'd' is 0 the result is placed in W register. If 'd' is 1 the result is placed in register 'f'. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write to destination Example SWAPF REG, 0 Before Instruction REG1 = 0xA5 After Instruction REG1 = 0xA5 W = 0x5A TRIS Load TRIS Register Syntax: [ label] TRIS f Operands: 5 ≤ f ≤ 7 Operation: (W) → TRIS register f; Status Affected: None Encoding: 00 0000 0110 0fff Description: The instruction is supported for code compatibility with the PIC16C5X prod- ucts. Since TRIS registers are read- able and writable, the user can directly address them. Words: 1 Cycles: 1 Example To maintain upward compatibility with future PIC16CXX products, do not use this instruction. |
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