PIC18LF24K Datasheet, PDF (258/594 Pages) –

PIC18(L)F26/45/46K40
20.6.7
EDGE-TRIGGERED HARDWARE
LIMIT ONE-SHOT MODE
In Edge-Triggered Hardware Limit One-Shot modes
the timer starts on the first external signal edge after
the ON bit is set and resets on all subsequent edges.
Only the first edge after the ON bit is set is needed to
start the timer. The counter will resume counting
automatically two clocks after all subsequent external
Reset edges. Edge triggers are as follows:
• Rising edge Start and Reset
(MODE<4:0> = 01100)
• Falling edge Start and Reset
(MODE<4:0> = 01101)
The timer resets and clears the ON bit when the timer
value matches the PRx period value. External signal
edges will have no effect until after software sets the
ON bit. Figure 20-10 illustrates the rising edge hard-
ware limit one-shot operation.
When this mode is used in conjunction with the CCP
then the first starting edge trigger, and all subsequent
Reset edges, will activate the PWM drive. The PWM
drive will deactivate when the timer matches the
CCPRx pulse-width value and stay deactivated until
the timer halts at the PRx period match unless an exter-
nal signal edge resets the timer before the match
occurs.
 2016 Microchip Technology Inc.
Preliminary
DS40001816C-page 258