PIC16LF720_11 Datasheet, PDF (109/244 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F720/721
15.0 CAPTURE/COMPARE/PWM
(CCP) MODULE
The Capture/Compare/PWM module is a peripheral
which allows the user to time and control different
events. In Capture mode, the peripheral allows the
timing of the duration of an event. The Compare mode
allows the user to trigger an external event when a
predetermined amount of time has expired. The PWM
mode can generate a Pulse-Width Modulated signal of
varying frequency and duty cycle.
The timer resources used by the module are shown in
Table 15-1.
Additional information on CCP modules is available in
the Application Note AN594, “Using the CCP Modules”
(DS00594).
TABLE 15-1: CCP MODE – TIMER
RESOURCES REQUIRED
CCP Mode
Timer Resource
Capture
Compare
PWM
Timer1
Timer1
Timer2
REGISTER 15-1: CCP1CON: CCP1 CONTROL REGISTER
U-0
—
bit 7
U-0
R/W-0
R/W-0
R/W-0
—
DC1
B1
CCP1M3
R/W-0
CCP1M2
R/W-0
CCP1M1
R/W-0
CCP1M0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
bit 5-4
bit 3-0
Unimplemented: Read as ‘0’
DC1:B1: PWM Duty Cycle Least Significant bits
Capture mode:
Unused
Compare mode:
Unused
PWM mode:
These bits are the two LSbs of the PWM duty cycle. The eight MSbs are found in CCPR1L.
CCP1M<3:0>: CCP mode Select bits
0000 = Capture/Compare/PWM off (resets CCP module)
0001 = Unused (reserved)
0010 = Compare mode, toggle output on match (CCP1IF bit of the PIRx register is set)
0011 = Unused (reserved)
0100 = Capture mode, every falling edge
0101 = Capture mode, every rising edge
0110 = Capture mode, every 4th rising edge
0111 = Capture mode, every 16th rising edge
1000 = Compare mode, set output on match (CCP1IF bit of the PIR1 register is set)
1001 = Compare mode, clear output on match (CCP1IF bit of the PIR1 register is set)
1010 = Compare mode, generate software interrupt on match (CCP1IF bit is set of the PIRx register,
CCP1 pin is unaffected)
1011 = Compare mode, trigger special event (CCP1IF bit of the PIR1register is set, TMR1 is reset
and A/D conversion is started if the ADC module is enabled. CCP1 pin is unaffected.)
11xx = PWM mode.
 2011 Microchip Technology Inc.
Preliminary
DS41430B-page 109