PIC18F87K22 Datasheet, PDF (203/548 Pages) Microchip Technology – 64/80-Pin, High-Performance, 1-Mbit Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt XLP Technology

PIC18F87K22 FAMILY
14.8.3 TIMER1 GATE TOGGLE MODE
When Timer1 Gate Toggle mode is enabled, it is
possible to measure the full cycle length of a Timer1
gate signal, as opposed to the duration of a single level
pulse.
The Timer1 gate source is routed through a flip-flop that
changes state on every incrementing edge of the
signal. (For timing details, see Figure 14-5.)
The T1GVAL bit (T1GCON<2>) indicates when the
Toggled mode is active and the timer is counting.
The Timer1 Gate Toggle mode is enabled by setting the
T1GTM bit (T1GCON<5>). When T1GTM is cleared,
the flip-flop is cleared and held clear. This is necessary
in order to control which edge is measured.
FIGURE 14-5:
TIMER1 GATE TOGGLE MODE
TMR1GE
T1GPOL
T1GTM
T1G_IN
T1CKI
T1GVAL
Timer1
N
N+1 N+2 N+3
N+4
N+5 N+6 N+7 N+8
 2010 Microchip Technology Inc.
Preliminary
DS39960B-page 203