Using UTMR as CCP (Capture/Compare/PWM)

The CCP (Capture/Compare) module is a peripheral which uses TMR1/TMR2 as the time base to perform Capture/Compare/PWM operations. The Capture/Compare modes use TMR1 as time base, whereas PWM mode uses TMR2 as time base. The following table shows UTMR settings in different CCP modes:

Table 1. UTMR Settings for Different CCP Modes
CCP MODE[3:0] CCP Mode CCP Operation UTMR Settings

If START/RESET/STOP = <blank>, set based on use case

Comments
START RESET STOP Other
0001 Compare Toggle output; clear TMR1 At PR Match Use OM = Pulse mode and OPOL to generate appropriate output. Set/Clear/Toggle output features are not available in UTMR.
0010 Toggle output
1000 Set output
1001 Clear output
1010 Pulse output OM = Pulse output
1011 Pulse output; clear TMR1 At PR Match OM = Pulse output
0011 Capture Every edge of CCPx input Either ERS Edge
0100 Every falling edge of CCPx input Rising ERS Edge EPOL = Inverted
0101 Every rising edge of CCPx input
0110 Every 4th rising edge of CCPx input Use CLC or NCO as a frequency divider and use that as ERS input.
0111 Every 16th rising edge of CCPx input
11xx PWM PWM operation Rising ERS Edge At Start + PR Match At PR Match

OM = Level output

OPOL = 0 for left-aligned PWM

OPOL = 1 for right-aligned PWM

UTMR requires a periodic ERS input to act as the PWM period. The PR value determines the PWM duty cycle.