PIC12F635ESS datasheet(83/234 Pages) MICROCHIP

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DS41232D-page 81

PIC12F635/PIC16F636/639

7.9

Comparator Gating Timer1

This feature can be used to time the duration or inter-

val of analog events. Clearing the T1GSS bit of the

CMCON1 register will enable Timer1 to increment

based on the output of the comparator (or Comparator

C2 for PIC16F636/639). This requires that Timer1 is

on and gating is enabled. See Section 6.0 “Timer1

Module with Gate Control” for details.

It is recommended to synchronize the comparator with

Timer1 by setting the CxSYNC bit when the comparator

is used as the Timer1 gate source. This ensures Timer1

does not miss an increment if the comparator changes

during an increment.

7.10

Synchronizing Comparator Output

to Timer1

The comparator (or Comparator C2 for PIC16F636/639)

output can be synchronized with Timer1 by setting the

CxSYNC bit of the CMCON1 register. When enabled,

the comparator output is latched on the falling edge of

the Timer1 clock source. If a prescaler is used with

Timer1, the comparator output is latched after the

prescaling function. To prevent a race condition, the

comparator output is latched on the falling edge of the

Timer1 clock source and Timer1 increments on the rising

edge of its clock source. See the Comparator Block

Diagram (Figure 7-2) and the Timer1 Block Diagram

(Figure 6-1) for more information.

Note:

References to the comparator in this

section

specifically

are

referring

Comparator C2 on the PIC16F636/639.

Note:

References to the comparator in this

section

specifically

are

referring

Comparator C2 on the PIC16F636/639.

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