PIC16F88

Manufacturer Part NumberPIC16F88
ManufacturerMicrochip Technology Inc.
PIC16F88 datasheet
 
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Page 83/228:

CAPTURE/COMPARE/PWM (CCP) MODULE

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9.0
CAPTURE/COMPARE/PWM
(CCP) MODULE
The Capture/Compare/PWM (CCP) module contains a
16-bit register that can operate as a:
• 16-bit Capture register
• 16-bit Compare register
• PWM Master/Slave Duty Cycle register.
Table 9-1 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. The special event trigger is
generated by a compare match which will reset Timer1
and start an A/D conversion (if the A/D module is
enabled).
REGISTER 9-1:
CCP1CON: CAPTURE/COMPARE/PWM CONTROL REGISTER 1 (ADDRESS 17h)
U-0
U-0
bit 7
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
CCP1M<3:0>: CCP1 Mode Select bits
0000 = Capture/Compare/PWM disabled (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 pin is unaffected); CCP1
resets TMR1 and starts an A/D conversion (if A/D module is enabled)
11xx = PWM mode
Legend:
R = Readable bit
-n = Value at POR
 2005 Microchip Technology Inc.
The CCP module’s input/output pin (CCP1) can be
configured as RB0 or RB3. This selection is set in bit 12
(CCPMX) of the Configuration Word.
Additional information on the CCP module is available
®
in the “PICmicro
Mid-Range MCU Family Reference
Manual” (DS33023) and in Application Note AN594,
“Using the CCP Module(s)” (DS00594).
TABLE 9-1:
CCP MODE – TIMER
RESOURCE
CCP Mode
Capture
Compare
PWM
R/W-0
R/W-0
R/W-0
CCP1X
CCP1Y
CCP1M3
CCP1M2
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘1’ = Bit is set
‘0’ = Bit is cleared
PIC16F87/88
Timer Resource
Timer1
Timer1
Timer2
R/W-0
R/W-0
R/W-0
CCP1M1
CCP1M0
bit 0
x = Bit is unknown
DS30487C-page 81