PIC17C752-08SLASHCL datasheet(99/328 Pages) MICROCHIP

99 / 328 page

DS30289A-page 99

PIC17C7XX

13.0

TIMER1, TIMER2, TIMER3,

PWMS AND CAPTURES

The PIC17C7XX has a wealth of timers and time-based

functions to ease the implementation of control applica-

tions. These time-base functions include three PWM

outputs and four Capture inputs.

Timer1 and Timer2 are two 8-bit incrementing timers,

each with an 8-bit period register (PR1 and PR2

respectively) and separate overﬂow interrupt ﬂags.

Timer1 and Timer2 can operate either as timers (incre-

ment on internal Fosc/4 clock) or as counters (incre-

ment on falling edge of external clock on pin

RB4/TCLK12). They are also software conﬁgurable to

operate as a single 16-bit timer/counter. These timers

are also used as the time-base for the PWM (Pulse

Width Modulation) modules.

Timer3 is a 16-bit timer/counter which uses the TMR3H

and TMR3L registers. Timer3 also has two additional

registers (PR3H/CA1H: PR3L/CA1L) that are conﬁg-

urable as a 16-bit period register or a 16-bit capture

ment from the internal system clock (FOSC/4) or from

an external signal on the RB5/TCLK3 pin. Timer3 is the

time-base for all of the 16-bit captures.

Six other registers comprise the Capture2, Capture3,

and Capture4 registers (CA2H:CA2L, CA3H:CA3L,

and CA4H:CA4L).

Figure 13-1, Figure 13-2, and Figure 13-3 are the con-

trol registers for the operation of Timer1, Timer2, and

Timer3, as well as PWM1, PWM2, PWM3, Capture1,

Capture2, Capture3, and Capture4.

Table 13-1 shows the Timer resource requirements for

these time-base functions. Each timer is an open

resource so that multiple functions may operate with it.

TABLE 13-1:

TIME-BASE FUNCTION /

RESOURCE

REQUIREMENTS

Time-base Function

Timer Resource

PWM1

Timer1

PWM2

Timer1 or Timer2

PWM3

Timer1 or Timer2

Capture1

Timer3

Capture2

Timer3

Capture3

Timer3

Capture4

Timer3

FIGURE 13-1: 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: Timer2:Timer1 Mode Select bit

1 = Timer2 and Timer1 form a 16-bit timer

0 = Timer2 and Timer1 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

PIC17C752-08/CL датащи(PDF) 99 Page - Microchip Technology

PIC17C752-08/CL датащи(HTML) 99 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL