PIC16C62B/72A
7.0
CAPTURE/COMPARE/PWM
(CCP) MODULE
Additional information on the CCP module is available
in the PICmicro™ Mid-Range Reference Manual,
(DS33023).
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 7-1 shows the
timer resources of the CCP module modes.
Capture/Compare/PWM Register 1 (CCPR1) is com-
prised 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.
TABLE 7-1
CCP MODE - TIMER
RESOURCE
Timer Resource
Timer1
Timer1
Timer2
CCP Mode
Capture
Compare
PWM
TABLE 7-2
INTERACTION OF TWO CCP MODULES
Interaction
Same TMR1 time-base.
The compare should be configured for the special event trigger, which clears TMR1.
The compare(s) should be configured for the special event trigger, which clears TMR1.
The PWMs will have the same frequency and update rate (TMR2 interrupt).
None.
None.
CCPx Mode CCPy Mode
Capture
Capture
Compare
PWM
PWM
PWM
Capture
Compare
Compare
PWM
Capture
Compare
REGISTER 7-1:CCP1CON REGISTER (ADDRESS 17h)
U-0
—
bit7
U-0
—
R/W-0
R/W-0
R/W-0
CCP1X CCP1Y CCP1M3
R/W-0
CCP1M2
R/W-0
R/W-0
CCP1M1 CCP1M0
bit0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read
as ‘0’
- n =Value at POR reset
bit 7-6:
Unimplemented:
Read as '0'
bit 5-4:
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 CCPR1L.
bit 3-0:
CCP1M3:CCP1M0:
CCP1 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 and starts an A/D
conversion (if A/D module is enabled))
11xx
= PWM mode
©
1999 Microchip Technology Inc.
Preliminary
DS35008B-page 33
MICROCHIP [ MICROCHIP TECHNOLOGY ]
