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PIC18F2450/4450
2006 Microchip Technology Inc.
Advance Information
DS39760A-page 123
13.0
CAPTURE/COMPARE/PWM
(CCP) MODULE
PIC18F2450/4450 devices have one CCP (Capture/
Compare/PWM) module. The module contains a 16-bit
register, which can operate as a 16-bit Capture register,
a 16-bit Compare register or a PWM Master/Slave Duty
Cycle register.
REGISTER 13-1:
CCP1CON: CAPTURE/COMPARE/PWM CONTROL REGISTER
U-0
R/W-0
—
DC1B1
DC1B0
CCP1M3
CCP1M2
CCP1M1
CCP1M0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
Unimplemented: Read as ‘0’
bit 5-4
DC1B1:DC1B0: PWM Duty Cycle for CCP Module bits
Capture mode:
Unused.
Compare mode:
Unused.
PWM mode:
These bits are the two LSbs (bit 1 and bit 0) of the 10-bit PWM duty cycle. The eight MSbs of the duty
cycle are found in CCPR1L.
bit 3-0
CCP1M3:CCP1M0: CCP Module Mode Select bits
0000
= Capture/Compare/PWM disabled (resets CCP module)
0001
= Reserved
0010
= Compare mode: toggle output on match (CCP1IF bit is set)
0011
= 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: initialize CCP1 pin low; on compare match, force CCP1 pin high
(CCP1IF bit is set)
1001
= Compare mode: initialize CCP1 pin high; on compare match, force CCP1 pin low
(CCP1IF bit is set)
1010
= Compare mode: generate software interrupt on compare match (CCP1IF bit is set,
CCP1 pin reflects I/O state)
1011
= Compare mode: trigger special event, reset timer and start A/D conversion on CCP1 match
(CCP1IF bit is set)
11xx
=PWM mode
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