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Microchip Technology ARD00385 Data Sheet

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PIC18F87K90 FAMILY
DS39957D-page 252
 2009-2011 Microchip Technology Inc.
 
REGISTER 19-1:
CCPxCON: ENHANCED CAPTURE/COMPARE/PWM x CONTROL
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
PxM1
PxM0
DCxB1
DCxB0
CCPxM3
CCPxM2
CCPxM1
CCPxM0
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
PxM<1:0>: 
Enhanced PWM Output Configuration bits
If CCPxM<3:2> = 00, 01, 10:
xx
 = PxA is assigned as a capture/compare input/output; PxB, PxC and PxD are assigned as PORT pins
If CCPxM<3:2> = 11:
00
 = Single output: PxA, PxB, PxC and PxD are controlled by steering (see 
)
01
 = Full-bridge output forward: PxD is modulated; PxA is active; PxB, PxC are inactive
10
 = Half-bridge output: PxA, PxB are modulated with dead-band control; PxC and PxD are
assigned as PORT pins
11
 = Full-bridge output reverse: PxB is modulated; PxC is active; PxA and PxD are inactive
bit 5-4
DCxB<1:0>
: PWM Duty Cycle Bit 1 and Bit 0
Capture mode:
Unused.
Compare mode:
Unused.
PWM mode:
These bits are the two LSbs of the 10-bit PWM duty cycle. The eight MSbs of the duty cycle are found 
in CCPRxL.
bit 3-0
CCPxM<3:0>
: ECCPx Mode Select bits
0000
 = Capture/Compare/PWM off (resets ECCPx module)
0001
 = Reserved
0010
 = Compare mode: toggle output on match
0011
 = Capture mode
0100
 = Capture mode: every falling edge
0101
 = Capture mode: every rising edge
0110
 = Capture mode: every fourth rising edge 
0111
 = Capture mode: every 16
th
 rising edge
1000
 = Compare mode: initialize the ECCPx pin low; set the output on a compare match (set CCPxIF)
1001
 = Compare mode: initialize the ECCPx pin high; clear the output on a compare match (set CCPxIF)
1010
 = Compare mode: generate a software interrupt only; ECCPx pin reverts to an I/O state
1011
 = Compare mode: trigger special event (ECCPx resets TMR1 or TMR3, starts A/D conversion,
sets CCxIF bit)
1100
 = PWM mode: PxA and PxC are active-high; PxB and PxD are active-high
1101
 = PWM mode: PxA and PxC are active-high; PxB and PxD are active-low
1110
 = PWM mode: PxA and PxC are active-low; PxB and PxD are active-high
1111
 = PWM mode: PxA and PxC are active-low; PxB and PxD are active-low