PIC16C770 Microchip Technology Inc., PIC16C770 Datasheet - Page 55

• Manufacturer Part Number: PIC16C770
• Description: 18/20-pin, 8-bit Cmos Microcontrollers With 10/12-bit A/d
• Manufacturer: Microchip Technology Inc.

8.0
The
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 8-1 shows the timer resources of the ECCP mod-
ule modes.
REGISTER 8-1:
2002 Microchip Technology Inc.
ECCP
ENHANCED CAPTURE/
COMPARE/PWM (ECCP)
MODULES
bit 7-6
bit 5-4
bit 3-0
(Enhanced
CCP1 CONTROL REGISTER (CCP1CON: 17h)
PWM1M<1:0>: PWM Output Configuration
CCP1M<3:2> = 00, 01, 10
xx = P1A assigned as Capture input, Compare output. P1B, P1C, P1D assigned as Port pins.
CCP1M<3:2> = 11
00 = Single output. P1A modulated. P1B, P1C, P1D assigned as Port pins.
01 = Full-bridge output forward. P1D modulated. P1A active. P1B, P1C inactive.
10 = Half-bridge output. P1A, P1B modulated with deadband control. P1C, P1D assigned as
11 = Full-bridge output reverse. P1B modulated. P1C active. P1A, P1D inactive.
DC1B<1:0>: PWM Duty Cycle 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
CCP1M<3:0>: ECCP Mode Select bits
0000 = Capture/Compare/PWM off (resets ECCP module)
0001 = Unused (reserved)
0010 = Compare mode, toggle output on match (CCP1IF bit is set)
0011 = Unused (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, 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
1011 = Compare mode, trigger special event (CCP1IF bit is set; ECCP resets TMR1, and starts
1100 = PWM mode. P1A, P1C active high. P1B, P1D active high.
1101 = PWM mode. P1A, P1C active high. P1B, P1D active low.
1110 = PWM mode. P1A, P1C active low. P1B, P1D active high.
1111 = PWM mode. P1A, P1C active low. P1B, P1D active low.
bit 7
Legend:
R = Readable bit
- n = Value at POR
PWM1M1 PWM1M0
R/W-0
Port pins.
Capture/Compare/PWM)
an A/D conversion, if the A/D module is enabled.)
unaffected)
CCPRnL.
R/W-0
DC1B1
R/W-0
W = Writable bit
’1’ = Bit is set
DC1B0
R/W-0
Capture/Compare/PWM Register1 (CCPR1) is com-
prised of two 8-bit registers: CCPR1L (low byte) and
CCPR1H (high byte). The CCP1CON and P1DEL reg-
isters control the operation of ECCP. All are readable
and writable.
PIC16C717/770/771
CCP1M3
R/W-0
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
CCP1M2
R/W-0
CCP1M1
x = Bit is unknown
R/W-0
DS41120B-page 53
CCP1M0
R/W-0
bit 0