Programming 8-bit PIC Microcontrollers in C

3.3. PIC16 C Hardware Timers

• Counter/timers

• Capture and Compare

• Timer interrupt

The PIC 16F877 has three hardware timers built in: Timer0 (originally called RTCC, the real-time counter clock), Timer1, and Timer2. The principal mode of operation of these registers are as counters for external events or timers using the internal clock. Additional registers are used to provide Capture, Compare, and Pulse Width Modulation (PWM) modes. The CCS timer function set is shown in Table 3.5

Table 3.5. Timer Functions

Action	Description	Example
TIMERX SETUP	Set up the timer mode	setup_timer0(RTCC_INTERNAL|RTCC_DIV_8 );
TIMERX READ	Read a timer register (8 or 16 bits)	count0=get_timer0();
TIMERX WRITE	Preload a timer register (8 or 16 bits)	set_timer0(126);
CCPX SETUP ...