PIC16F627A_05 Datasheet, PDF (57/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
9.0 CAPTURE/COMPARE/PWM
(CCP) MODULE
The CCP (Capture/Compare/PWM) module contains a
16-bit register which can operate as a 16-bit Capture
register, as a 16-bit Compare register or as a PWM
master/slave Duty Cycle register. Table 9-1 shows the
timer resources of the CCP module modes.
CCP1 Module
Capture/Compare/PWM Register1 (CCPR1) is
comprised of two 8-bit registers: CCPR1L (low byte)
and CCPR1H (high byte). The CCP1CON register
controls the operation of CCP1. All are readable and
writable.
Additional information on the CCP module is available
in the “PICmicro^® Mid-Range MCU Family Reference
Manual” (DS33023).
TABLE 9-1: CCP MODE – TIMER
RESOURCE
CCP Mode
Timer Resource
Capture
Compare
PWM
Timer1
Timer1
Timer2
REGISTER 9-1:
CCP1CON – CCP OPERATION REGISTER (ADDRESS: 17h)
U-0
U-0
R/W-0 R/W-0
R/W-0
R/W-0 R/W-0 R/W-0
—
—
CCP1X CCP1Y CCP1M3 CCP1M2 CCP1M1 CCP1M0
bit 7
bit 0
bit 7-6
bit 5-4
bit 3-0
Unimplemented: Read as ‘0’
CCP1X:CCP1Y: PWM 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 CCPRxL.
CCP1M<3:0>: CCPx Mode Select bits
0000 = Capture/Compare/PWM off (resets CCP1 module)
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 is set)
1001 = Compare mode, clear output on match (CCP1IF bit is set)
1010 = Compare mode, generate software interrupt on match (CCP1IF bit is set, CCP1 pin is
unaffected)
1011 = Compare mode, trigger special event (CCP1IF bit is set; CCP1 resets TMR1
11xx = PWM mode
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
© 2005 Microchip Technology Inc.
DS40044D-page 55