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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16CE62X датащи(PDF) 39 Page - Microchip Technology |
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PIC16CE62X датащи(HTML) 39 Page - Microchip Technology |
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39 / 108 page  © 1998 Microchip Technology Inc. Preliminary DS40182A-page 39 PIC16CE62X 7.3.1 SWITCHING PRESCALER ASSIGNMENT The prescaler assignment is fully under software control (i.e., it can be changed “on the fly” during program execution). To avoid an unintended device RESET, the following instruction sequence (Example 7-1) must be executed when changing the prescaler assignment from Timer0 to WDT. EXAMPLE 7-1: CHANGING PRESCALER (TIMER0 →WDT) 1.BCF STATUS, RP0 ;Skip if already in ; Bank 0 2.CLRWDT ;Clear WDT 3.CLRF TMR0 ;Clear TMR0 & Prescaler 4.BSF STATUS, RP0 ;Bank 1 5.MOVLW '00101111’b; ;These 3 lines (5, 6, 7) 6.MOVWF OPTION ; are required only if ; desired PS<2:0> are 7.CLRWDT ; 000 or 001 8.MOVLW '00101xxx’b ;Set Postscaler to 9.MOVWF OPTION ; desired WDT rate 10.BCF STATUS, RP0 ;Return to Bank 0 To change prescaler from the WDT to the TMR0 module use the sequence shown in Example 7-2. This precaution must be taken even if the WDT is disabled. EXAMPLE 7-2: CHANGING PRESCALER (WDT →TIMER0) CLRWDT ;Clear WDT and ;prescaler BSF STATUS, RP0 MOVLW b'xxxx0xxx' ;Select TMR0, new ;prescale value and ;clock source MOVWF OPTION_REG BCF STATUS, RP0 TABLE 7-1: REGISTERS ASSOCIATED WITH TIMER0 Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on: POR / BOR Value on All Other Resets 01h TMR0 Timer0 module register xxxx xxxx uuuu uuuu 0Bh/8Bh INTCON GIE PEIE T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 000x 81h OPTION RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111 85h TRISA — — — TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 ---1 1111 ---1 1111 Legend: — = Unimplemented locations, read as ‘0’. Note: Shaded bits are not used by TMR0 module. 62X.bk Page 39 Tuesday, March 10, 1998 3:40 PM |
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