Datasheet

© 2006 Microchip Technology Inc. DS41159E-page 133
PIC18FXX8
16.2 Capture Mode
The Capture mode of the ECCP module is virtually
identical in operation to that of the standard CCP mod-
ule as discussed in Section 15.1 “CCP1 Module”.
The differences are in the registers and port pins
involved:
• The 16-bit Capture register is ECCPR1
(ECCPR1H and ECCPR1L);
• The capture event is selected by control bits
ECCP1M3:ECCP1M0 (ECCP1CON<3:0>);
• The interrupt bits are ECCP1IE (PIE2<0>) and
ECCP1IF (PIR2<0>); and
• The capture input pin is RD4 and its corresponding
direction control bit is TRISD<4>.
Other operational details, including timer selection,
output pin configuration and software interrupts, are
exactly the same as the standard CCP module.
16.2.1 CAN MESSAGE TIME-STAMP
The special capture event for the reception of CAN mes-
sages (Section 15.2.5 “CAN Message Time-Stamp”)
is not available with the ECCP module.
16.3 Compare Mode
The Compare mode of the ECCP module is virtually
identical in operation to that of the standard CCP
module as discussed in Section 15.2 “Capture
Mode”. The differences are in the registers and port
pins as described in Section 16.2 “Capture Mode”.
All other details are exactly the same.
16.3.1 SPECIAL EVENT TRIGGER
Except as noted below, the special event trigger output
of ECCP1 functions identically to that of the standard
CCP module. It may be used to start an A/D conversion
if the A/D module is enabled.
TABLE 16-4: REGISTERS ASSOCIATED WITH ENHANCED CAPTURE, COMPARE,
TIMER1 AND TIMER3
Note: The special event trigger from the ECCP1
module will not set the Timer1 or Timer3
interrupt flag bits.
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
POR, BOR
Value on
all other
Resets
INTCON GIE/GIEH PEIE/GIEL
TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u
PIR2
— CMIF — EEIF BCLIF LVDIF TMR3IF ECCP1IF -0-0 0000 -0-0 0000
PIE2
— CMIE — EEIE BCLIE LVDIE TMR3IE ECCP1IE -0-0 0000 -0-0 0000
IPR2
— CMIP — EEIP BCLIP LVDIP TMR3IP ECCP1IP -1-1 1111 -1-1 1111
TMR1L Holding Register for the Least Significant Byte of the 16-bit TMR1 Register xxxx xxxx uuuu uuuu
TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Register xxxx xxxx uuuu uuuu
T1CON RD16
— T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 0-00 0000 u-uu uuuu
TMR3L Holding Register for the Least Significant Byte of the 16-bit TMR3 Register xxxx xxxx uuuu uuuu
TMR3H Holding Register for the Most Significant Byte of the 16-bit TMR3 Register xxxx xxxx uuuu uuuu
T3CON RD16 T3ECCP1 T3CKPS1 T3CKPS0 T3CCP1 T3SYNC
TMR3CS TMR3ON 0000 0000 uuuu uuuu
TRISD PORTD Data Direction Register 1111 1111 1111 1111
ECCPR1L Capture/Compare/PWM Register1 (LSB) xxxx xxxx uuuu uuuu
ECCPR1H Capture/Compare/PWM Register1 (MSB) xxxx xxxx uuuu uuuu
ECCP1CON
EPWM1M1 EPWM1M0 EDC1B1 EDC1B0 ECCP1M3 ECCP1M2 ECCP1M1 ECCP1M0 0000 0000 0000 0000
Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by the ECCP module and Timer1.