Datasheet

 2010 Microchip Technology Inc. DS41302D-page 61
PIC12F609/615/617/12HV609/615
7.10 ECCP Special Event Trigger
(PIC12F615/617/HV615 only)
If a ECCP is configured to trigger a special event, the
trigger will clear the TMR1H:TMR1L register pair. This
special event does not cause a Timer1 interrupt. The
ECCP module may still be configured to generate a
ECCP interrupt.
In this mode of operation, the CCPR1H:CCPR1L
register pair effectively becomes the period register for
Timer1.
Timer1 should be synchronized to the F
OSC to utilize
the Special Event Trigger. Asynchronous operation of
Timer1 can cause a Special Event Trigger to be
missed.
In the event that a write to TMR1H or TMR1L coincides
with a Special Event Trigger from the ECCP, the write
will take precedence.
For more information, see Section 11.0 “Enhanced
Capture/Compare/PWM (With Auto-Shutdown and
Dead Band) Module (PIC12F615/617/HV615 only)”.
7.11 Comparator Synchronization
The same clock used to increment Timer1 can also be
used to synchronize the comparator output. This
feature is enabled in the Comparator module.
When using the comparator for Timer1 gate, the
comparator output should be synchronized to Timer1.
This ensures Timer1 does not miss an increment if the
comparator changes.
For more information, see Section 9.0 “Comparator
Module”.
FIGURE 7-2: TIMER1 INCREMENTING EDGE
T1CKI = 1
when TMR1
Enabled
T1CKI = 0
when TMR1
Enabled
Note 1: Arrows indicate counter increments.
2: In Counter mode, a falling edge must be registered by the counter prior to the first incrementing rising edge of
the clock.