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P12C508 データシート(PDF) 22 Page - Microchip Technology |
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P12C508 データシート(HTML) 22 Page - Microchip Technology |
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22 / 84 page  PIC12C5XX DS40139A-page 22 Advance Information © 1996 Microchip Technology Inc. FIGURE 6-2: TIMER0 TIMING: INTERNAL CLOCK/NO PRESCALE FIGURE 6-3: TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2 TABLE 6-1: REGISTERS ASSOCIATED WITH TIMER0 Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on Power-On Reset Value on MCLR and WDT Reset Value on Wake-up on Pin Change 01h TMR0 Timer0 - 8-bit real-time clock/counter xxxx xxxx uuuu uuuu uuuu uuuu N/A OPTION GPWU GPPU T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111 1111 1111 N/A TRIS I/O control registers --11 1111 --11 1111 --11 1111 Legend: Shaded cells not used by Timer0, - = unimplemented, x = unknown, u = unchanged, PC-1 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 PC (Program Counter) Instruction Fetch Timer0 PC PC+1 PC+2 PC+3 PC+4 PC+5 PC+6 T0 T0+1 T0+2 NT0 NT0 NT0 NT0+1 NT0+2 MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W Write TMR0 executed Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 + 1 Read TMR0 reads NT0 + 2 Instruction Executed PC-1 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 PC (Program Counter) Instruction Fetch Timer0 PC PC+1 PC+2 PC+3 PC+4 PC+5 PC+6 T0 NT0+1 MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W Write TMR0 executed Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 + 1 T0+1 NT0 Instruction Execute T0 |
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