Pugazhendhi.M 11/12/2018 TIMERS 11/12/2018 CCET CCET

Timer modules Timer module 0 Timer module 1 Timer module 2 11/12/2018 CCET

TIMER0 MODULE Software selectable as an 8-bit or 16-bit timer/ counter Readable and writable Dedicated 8-bit software programmable prescaler Clock source selectable to be external or internal Interrupt-on-overflow from FFh to 00h in 8-bit mode and FFFFh to 0000h in 16-bit mode Edge select for external clock 11/12/2018 CCET

TIMER0 CONTROL REGISTER T0CON: bit 7 TMR0ON: Timer0 On/Off Control bit bit 6 T08BIT: Timer0 8-bit/16-bit Control bit bit 5 T0CS: Timer0 Clock Source Select bit bit 4 T0SE: Timer0 Source Edge Select bit bit 3 PSA: Timer0 Prescaler Assignment bit bit 2-0 T0PS2:T0PS0: Timer0 Prescaler Select bits 11/12/2018 CCET

TIMER0 OPERATION Operate as a timer or counter Timer mode is selected by clearing the T0CS bit Counter mode is selected by setting the T0CS bit An 8-bit counter is available as a prescaler for the Timer0 module 11/12/2018 CCET

TIMER1 MODULE 16-bit timer/counter (two 8-bit registers; TMR1H and TMR1L) Readable and writable (both registers) Internal or external clock select Interrupt-on-overflow from FFFFh to 0000h RESET from CCP module special event trigger 11/12/2018 CCET

TIMER1 CONTROL REGISTER T1CON: bit 7 RD16: 16-bit Read/Write Mode Enable bit bit 6 Unimplemented: Read as '0' bit 5-4 T1CKPS1:T1CKPS0: Timer1 Input Clock Prescale Select bits bit 3 T1OSCEN: Timer1 Oscillator Enable bit bit 2 T1SYNC: Timer1 External Clock Input Synchronization Select bit bit 1 TMR1CS: Timer1 Clock Source Select bit bit 0 TMR1ON: Timer1 On bit 11/12/2018 CCET

TIMER1 OPERATION Operates as a timer, synchronous counter and as an asynchronous counter A crystal oscillator circuit is built-in between pins T1OSI (input) and T1OSO (amplifier output) This interrupt can be enabled/disabled by setting/clearing TMR1 interrupt enable bit 11/12/2018 CCET

TIMER2 MODULE 8-bit timer (TMR2 register) 8-bit period register (PR2) Readable and writable (both registers) Software programmable prescaler (1:1, 1:4, 1:16) Software programmable postscaler (1:1 to 1:16) Interrupt on TMR2 match of PR2 SSP module optional use of TMR2 output to generate clock shift 11/12/2018 CCET

TIMER2 CONTROL REGISTER T2CON: bit 7 Unimplemented: Read as '0' bit 6-3 TOUTPS3:TOUTPS0: Timer2 Output Postscale Select bits bit 2 TMR2ON: Timer2 On bit bit 1-0 T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits 11/12/2018 CCET

TIMER2 OPERATION Timer2 can be used as the PWM time-base for the PWM mode of the CCP module. The output of TMR2 (before the postscaler) is fed to the Synchronous Serial Port module, which optionally uses it to generate the shift clock. 11/12/2018 CCET

TIMER3 MODULE 16-bit timer/counter (two 8-bit registers; TMR3H and TMR3L) Readable and writable (both registers) Internal or external clock select Interrupt-on-overflow from FFFFh to 0000h RESET from CCP module trigger 11/12/2018 CCET

TIMER3 CONTROL REGISTER T3CON: bit 7 RD16: 16-bit Read/Write Mode Enable bit bit 6-3 T3CCP2:T3CCP1: Timer3 and Timer1 to CCPx Enable bits bit 5-4 T3CKPS1:T3CKPS0: Timer3 Input Clock Prescale Select bits bit 2 T3SYNC: Timer3 External Clock Input Synchronization Control bit bit 1 TMR3CS: Timer3 Clock Source Select bit bit 0 TMR3ON: Timer3 On bit 11/12/2018 CCET

TIMER3 OPERATION Operates as a timer, synchronous counter and as an asynchronous counter The TMR3 Register pair (TMR3H:TMR3L) increments from 0000h to FFFFh and rolls over to 0000h. 11/12/2018 CCET

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