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PIC18F23K20-E/ML Datasheet(PDF) 144 Page - Microchip Technology |
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PIC18F23K20-E/ML Datasheet(HTML) 144 Page - Microchip Technology |
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144 / 420 page  PIC18F2XK20/4XK20 DS41303B-page 142 Advance Information © 2007 Microchip Technology Inc. 12.1 Timer1 Operation Timer1 can operate in one of the following modes: •Timer • Synchronous Counter • Asynchronous Counter The operating mode is determined by the clock select bit, TMR1CS of the T1CON register. When TMR1CS is cleared (= 0), Timer1 increments on every internal instruction cycle (FOSC/4). When the bit is set, Timer1 increments on every rising edge of either the Timer1 external clock input or the Timer1 oscillator, if enabled. When the Timer1 oscillator is enabled, the digital circuitry associated with the RC1/T1OSI and RC0/T1OSO/T13CKI pins is disabled. This means the values of TRISC<1:0> are ignored and the pins are read as ‘0’. FIGURE 12-1: TIMER1 BLOCK DIAGRAM FIGURE 12-2: TIMER1 BLOCK DIAGRAM (16-BIT READ/WRITE MODE) T1SYNC TMR1CS T1CKPS<1:0> Sleep Input T1OSCEN(1) FOSC/4 Internal Clock On/Off Prescaler 1, 2, 4, 8 Synchronize Detect 1 0 2 T1OSO/T13CKI T1OSI 1 0 TMR1ON TMR1L Set TMR1IF on Overflow TMR1 High Byte Clear TMR1 (CCP Special Event Trigger) Timer1 Oscillator Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain. On/Off Timer1 Timer1 Clock Input T1SYNC TMR1CS T1CKPS<1:0> Sleep Input T1OSCEN(1) FOSC/4 Internal Clock Prescaler 1, 2, 4, 8 Synchronize Detect 1 0 2 T1OSO/T13CKI T1OSI Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain. 1 0 TMR1L Internal Data Bus 8 Set TMR1IF on Overflow TMR1 TMR1H High Byte 8 8 8 Read TMR1L Write TMR1L 8 TMR1ON Clear TMR1 (CCP Special Event Trigger) Timer1 Oscillator On/Off Timer1 Timer1 Clock Input |
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