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PIC16F84A Datasheet(PDF) 58 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 58 Page - Microchip Technology |
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58 / 124 page  PIC16F8X DS30430C-page 58 © 1998 Microchip Technology Inc. CLRF Clear f Syntax: [ label] CLRF f Operands: 0 ≤ f ≤ 127 Operation: 00h → (f) 1 → Z Status Affected: Z Encoding: 00 0001 1fff ffff Description: The contents of register 'f' are cleared and the Z bit is set. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register 'f' Process data Write register 'f' Example CLRF FLAG_REG Before Instruction FLAG_REG = 0x5A After Instruction FLAG_REG = 0x00 Z = 1 CLRW Clear W Syntax: [ label ] CLRW Operands: None Operation: 00h → (W) 1 → Z Status Affected: Z Encoding: 00 0001 0xxx xxxx Description: W register is cleared. Zero bit (Z) is set. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode No-Opera tion Process data Write to W Example CLRW Before Instruction W = 0x5A After Instruction W = 0x00 Z = 1 CLRWDT Clear Watchdog Timer Syntax: [ label ] CLRWDT Operands: None Operation: 00h → WDT 0 → WDT prescaler, 1 → TO 1 → PD Status Affected: TO, PD Encoding: 00 0000 0110 0100 Description: CLRWDT instruction resets the Watch- dog Timer. It also resets the prescaler of the WDT. Status bits TO and PD are set. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode No-Opera tion Process data Clear WDT Counter Example CLRWDT Before Instruction WDT counter = ? After Instruction WDT counter = 0x00 WDT prescaler= 0 TO = 1 PD = 1 |
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