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PIC12C67X Datasheet(PDF) 43 Page - Microchip Technology |
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PIC12C67X Datasheet(HTML) 43 Page - Microchip Technology |
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43 / 129 page  © 1999 Microchip Technology Inc. DS30561B-page 43 PIC12C67X 7.3.1 SWITCHING PRESCALER ASSIGNMENT The prescaler assignment is fully under software con- trol, (i.e., it can be changed “on-the-fly” during program execution). EXAMPLE 7-1: CHANGING PRESCALER (TIMER0 →WDT) BCF STATUS, RP0 ;Bank 0 CLRF TMR0 ;Clear TMR0 & Prescaler BSF STATUS, RP0 ;Bank 1 CLRWDT ;Clears WDT MOVLW b’xxxx1xxx’ ;Select new prescale MOVWF OPTION_REG ;value & WDT BCF STATUS, RP0 ;Bank 0 Note: To avoid an unintended device RESET, the following instruction sequence (shown in Example 7-1) must be executed when changing the prescaler assignment from Timer0 to the WDT. This sequence must be followed even if the WDT is disabled. To change prescaler from the WDT to the Timer0 mod- ule, use the sequence shown in Example 7-2. EXAMPLE 7-2: CHANGING PRESCALER (WDT →TIMER0) CLRWDT ;Clear WDT and ;prescaler BSF STATUS, RP0 ;Bank 1 MOVLW b’xxxx0xxx’ ;Select TMR0, new ;prescale value and MOVWF OPTION_REG ;clock source BCF STATUS, RP0 ;Bank 0 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 Value on all other Resets 01h TMR0 Timer0 module’s register xxxx xxxx uuuu uuuu 0Bh/8Bh INTCON GIE PEIE T0IE INTE GPIE T0IF INTF GPIF 0000 000x 0000 000u 81h OPTION GPPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111 85h TRIS — — TRIS5 TRIS4 TRIS3 TRIS2 TRIS1 TRIS0 --11 1111 --11 1111 Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by Timer0. |
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