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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16C71-04/P датащи(PDF) 34 Page - Microchip Technology |
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PIC16C71-04/P датащи(HTML) 34 Page - Microchip Technology |
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34 / 176 page  PIC16C71X DS30272A-page 34 © 1997 Microchip Technology Inc. 6.3 Prescaler An 8-bit counter is available as a prescaler for the Timer0 module, or as a postscaler for the Watchdog Timer, respectively (Figure 6-6). For simplicity, this counter is being referred to as “prescaler” throughout this data sheet. Note that there is only one prescaler available which is mutually exclusively shared between the Timer0 module and the Watchdog Timer. Thus, a prescaler assignment for the Timer0 module means that there is no prescaler for the Watchdog Timer, and vice-versa. The PSA and PS2:PS0 bits (OPTION<3:0>) determine the prescaler assignment and prescale ratio. When assigned to the Timer0 module, all instructions writing to the TMR0 register (e.g. CLRF 1, MOVWF 1, BSF 1,x ....etc.) will clear the prescaler. When assigned to WDT, a CLRWDT instruction will clear the prescaler along with the Watchdog Timer. The pres- caler is not readable or writable. Note: Writing to TMR0 when the prescaler is assigned to Timer0 will clear the prescaler count, but will not change the prescaler assignment. FIGURE 6-6: BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER RA4/T0CKI T0SE pin M U X CLKOUT (=Fosc/4) SYNC 2 Cycles TMR0 reg 8-bit Prescaler 8 - to - 1MUX M U X M U X Watchdog Timer PSA 0 1 0 1 WDT Time-out PS2:PS0 8 Note: T0CS, T0SE, PSA, PS2:PS0 are (OPTION<5:0>). PSA WDT Enable bit M U X 0 1 0 1 Data Bus Set flag bit T0IF on Overflow 8 PSA T0CS |
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