PIC18F87K22 Datasheet, PDF (204/548 Pages) Microchip Technology – 64/80-Pin, High-Performance, 1-Mbit Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt XLP Technology

PIC18F87K22 FAMILY
14.8.4
TIMER1 GATE SINGLE PULSE
MODE
When Timer1 Gate Single Pulse mode is enabled, it is
possible to capture a single pulse gate event. Timer1
Gate Single Pulse mode is enabled by setting the
T1GSPM bit (T1GCON<4>) and the T1GGO/T1DONE
bit (T1GCON<3>). The Timer1 will be fully enabled on
the next incrementing edge.
On the next trailing edge of the pulse, the T1GGO/
T1DONE bit will automatically be cleared. No other
gate events will be allowed to increment Timer1 until
the T1GGO/T1DONE bit is once again set in software.
Clearing the T1GSPM bit of the T1GCON register will
also clear the T1GGO/T1DONE bit. (For timing details,
see Figure 14-6.)
Simultaneously enabling the Toggle and Single Pulse
modes will permit both sections to work together. This
allows the cycle times on the Timer1 gate source to be
measured. (For timing details, see Figure 14-7.)
14.8.5 TIMER1 GATE VALUE STATUS
When the Timer1 gate value status is utilized, it is
possible to read the most current level of the gate
control value. The value is stored in the T1GVAL bit
(T1GCON<2>). This bit is valid even when the Timer1
gate is not enabled (TMR1GE bit is cleared).
FIGURE 14-6:
TIMER1 GATE SINGLE PULSE MODE
TMR1GE
T1GPOL
T1GSPM
T1GGO/
T1DONE
T1G_IN
Set by Software
Counting Enabled on
Rising Edge of T1G
Cleared by Hardware on
Falling Edge of T1GVAL
T1CKI
T1GVAL
Timer1
RTCCIF
N
Cleared by Software
N+1
N+2
Set by Hardware on
Falling Edge of T1GVAL
Cleared by
Software
DS39960B-page 204
Preliminary
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