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PIC16F84A Datasheet(PDF) 31 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 31 Page - Microchip Technology |
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31 / 124 page  PIC16F8X © 1998 Microchip Technology Inc. DS30430C-page 31 6.3.1 SWITCHING PRESCALER ASSIGNMENT The prescaler assignment is fully under software control (i.e., it can be changed “on the fly” during program execution). EXAMPLE 6-1: CHANGING PRESCALER (TIMER0 →WDT) BCF STATUS, RP0 ;Bank 0 CLRF TMR0 ;Clear TMR0 ; and Prescaler BSF STATUS, RP0 ;Bank 1 CLRWDT ;Clears WDT MOVLW b'xxxx1xxx' ;Select new MOVWF OPTION_REG ; prescale value BCF STATUS, RP0 ;Bank 0 EXAMPLE 6-2: CHANGING PRESCALER (WDT →TIMER0) CLRWDT ;Clear WDT and ; prescaler BSF STATUS, RP0 ;Bank 1 MOVLW b'xxxx0xxx' ;Select TMR0, new ; prescale value ’ and clock source MOVWF OPTION_REG ; BCF STATUS, RP0 ;Bank 0 TABLE 6-1 REGISTERS ASSOCIATED WITH TIMER0 Note: To avoid an unintended device RESET, the following instruction sequence (Example 6-1) must be executed when changing the prescaler assignment from Timer0 to the WDT. This sequence must be taken even if the WDT is disabled. To change prescaler from the WDT to the Timer0 module use the sequence shown in Example 6-2. Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on Power-on Reset Value on all other resets 01h TMR0 Timer0 module’s register xxxx xxxx uuuu uuuu 0Bh INTCON GIE EEIE T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 0000 81h OPTION_ REG RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111 85h TRISA — — — TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 ---1 1111 ---1 1111 Legend: x = unknown, u = unchanged. - = unimplemented read as '0'. Shaded cells are not associated with Timer0. |
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