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PIC18F258-E/LSQTP 데이터시트(PDF) 318 Page - Microchip Technology |
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PIC18F258-E/LSQTP 데이터시트(HTML) 318 Page - Microchip Technology |
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318 / 402 page ![]() PIC18FXX8 DS41159E-page 316 © 2006 Microchip Technology Inc. SLEEP Enter Sleep Mode Syntax: [ label ] SLEEP Operands: None Operation: 00h → WDT, 0 → WDT postscaler, 1 → TO, 0 → PD Status Affected: TO, PD Encoding: 0000 0000 0000 0011 Description: The Power-Down status bit (PD) is cleared. The Time-out status bit (TO) is set. Watchdog Timer and its postscaler are cleared. The processor is put into Sleep mode with the oscillator stopped. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode No operation Process Data Go to Sleep Example: SLEEP Before Instruction TO =? PD =? After Instruction TO =1 † PD =0 † If WDT causes wake-up, this bit is cleared. SUBFWB Subtract f from W with Borrow Syntax: [ label ] SUBFWB f [,d [,a]] Operands: 0 ≤ f ≤ 255 d ∈ [0,1] a ∈ [0,1] Operation: (W) – (f) – (C) → dest Status Affected: N, OV, C, DC, Z Encoding: 0101 01da ffff ffff Description: Subtract register ‘f’ and Carry flag (borrow) from W (2’s complement method). If ‘d’ is ‘0’, the result is stored in W. If ‘d’ is ‘1’, the result is stored 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: SUBFWB REG Before Instruction REG = 0x03 W = 0x02 C = 0x01 After Instruction REG = 0xFF W = 0x02 C = 0x00 Z = 0x00 N = 0x01 ; result is negative Example 2: SUBFWB REG, 0, 0 Before Instruction REG = 2 W= 5 C= 1 After Instruction REG = 2 W= 3 C= 1 Z= 0 N = 0 ; result is positive Example 3: SUBFWB REG, 1, 0 Before Instruction REG = 1 W= 2 C= 0 After Instruction REG = 0 W= 2 C= 1 Z = 1 ; result is zero N= 0 |
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