PIC17C44-08SLASHP datasheet(71/240 Pages) MICROCHIP

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DS30412C-page 71

PIC17C4X

12.0

TIMER1, TIMER2, TIMER3,

PWMS AND CAPTURES

The PIC17C4X has a wealth of timers and time-based

functions to ease the implementation of control applica-

tions. These time-base functions include two PWM out-

puts and two Capture inputs.

Timer1 and Timer2 are two 8-bit incrementing timers,

each with a period register (PR1 and PR2 respectively)

and separate overﬂow interrupt ﬂags. Timer1 and

Timer2 can operate either as timers (increment on

internal Fosc/4 clock) or as counters (increment on fall-

ing edge of external clock on pin RB4/TCLK12). They

are also software conﬁgurable to operate as a single

16-bit timer. These timers are also used as the

time-base for the PWM (pulse width modulation) mod-

ule.

Timer3 is a 16-bit timer/counter consisting of the

TMR3H and TMR3L registers. This timer has four other

associated registers. Two registers are used as a 16-bit

period

16-bit

Capture1

(PR3H/CA1H:PR3L/CA1L). The other two registers are

strictly the Capture2 registers (CA2H:CA2L). Timer3 is

the time-base for the two 16-bit captures.

TMR3 can be software conﬁgured to increment from

the internal system clock or from an external signal on

the RB5/TCLK3 pin.

Figure 12-1 and Figure 12-2 are the control registers

for the operation of Timer1, Timer2, and Timer3, as well

as PWM1, PWM2, Capture1, and Capture2.

FIGURE 12-1: TCON1 REGISTER (ADDRESS: 16h, BANK 3)

R/W - 0

CA2ED1 CA2ED0 CA1ED1 CA1ED0

T16

TMR3CS TMR2CS TMR1CS

R = Readable bit

W = Writable bit

-n = Value at POR reset

bit7

bit0

bit 7-6:

CA2ED1:CA2ED0: Capture2 Mode Select bits

00 = Capture on every falling edge

01 = Capture on every rising edge

10 = Capture on every 4th rising edge

11 = Capture on every 16th rising edge

bit 5-4:

CA1ED1:CA1ED0: Capture1 Mode Select bits

00 = Capture on every falling edge

01 = Capture on every rising edge

10 = Capture on every 4th rising edge

11 = Capture on every 16th rising edge

bit 3:

T16: Timer1:Timer2 Mode Select bit

1 = Timer1 and Timer2 form a 16-bit timer

0 = Timer1 and Timer2 are two 8-bit timers

bit 2:

TMR3CS: Timer3 Clock Source Select bit

1 = TMR3 increments off the falling edge of the RB5/TCLK3 pin

0 = TMR3 increments off the internal clock

bit 1:

TMR2CS: Timer2 Clock Source Select bit

1 = TMR2 increments off the falling edge of the RB4/TCLK12 pin

0 = TMR2 increments off the internal clock

bit 0:

TMR1CS: Timer1 Clock Source Select bit

1 = TMR1 increments off the falling edge of the RB4/TCLK12 pin

0 = TMR1 increments off the internal clock

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