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PIC17C752 Datasheet

  • PIC17C752

  • High-Performance 8-bit CMOS EPROM Microcontrollers with 10-b...

  • 3053.02KB

  • 304页

  • Microchip   Microchip

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PIC17C75X
13.0
TIMER1, TIMER2, TIMER3,
PWMS AND 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.
The PIC17C75X 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 over铿俹w interrupt 铿俛gs.
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 con铿乬urable 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 con铿乬-
urable as a 16-bit period register or a 16-bit capture
register. TMR3 can be software con铿乬ured to incre-
ment from the internal system clock (F
OSC
/4) or from
an external signal on the RB5/TCLK3 pin. Timer3 is the
time-base for all of the 16-bit captures.
TABLE 13-1:
TIME-BASE FUNCTION /
RESOURCE
REQUIREMENTS
Timer Resource
Timer1
Timer1 or Timer2
Timer1 or Timer2
Timer3
Timer3
Timer3
Timer3
Time-base Function
PWM1
PWM2
PWM3
Capture1
Capture2
Capture3
Capture4
FIGURE 13-1: TCON1 REGISTER (ADDRESS: 16h, BANK 3)
R/W - 0 R/W - 0 R/W - 0 R/W - 0 R/W - 0 R/W - 0 R/W - 0 R/W - 0
CA2ED1 CA2ED0 CA1ED1 CA1ED0
T16
TMR3CS TMR2CS TMR1CS
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
R = Readable bit
W = Writable bit
-n = Value at POR reset
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
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
bit 0:
漏
1997 Microchip Technology Inc.
Preliminary
DS30264A-page 91

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