
2011-2012 Microchip Technology Inc.
Preliminary
DS61168D-page 163
PIC32MX1XX/2XX
15.0 OUTPUT COMPARE
The Output Compare module (OCMP) is used to gen-
erate a single pulse or a train of pulses in response to
selected time base events. For all modes of operation,
the OCMP module compares the values stored in the
OCxR and/or the OCxRS registers to the value in the
selected timer. When a match occurs, the OCMP
module generates an event based on the selected
mode of operation.
The following are some of the key features:
Multiple Output Compare Modules in a device
Programmable interrupt generation on compare
event
Single and Dual Compare modes
Single and continuous output pulse generation
Pulse-Width Modulation (PWM) mode
Hardware-based PWM Fault detection and
automatic output disable
Programmable selection of 16-bit or 32-bit time
bases
Can operate from either of two available 16-bit
time bases or a single 32-bit time base
FIGURE 15-1:
OUTPUT COMPARE MODULE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the PIC32MX1XX/2XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 16. “Output
Compare” (DS61111) in the “PIC32
Family Reference Manual”, which is
(www.microchip.com/PIC32). 2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
this data sheet for device-specific register
and bit information.
OCxR(1)
Comparator
Output
Logic
Q
S
R
OCM<2:0>
Output Enable
OCx(1)
Set Flag bit
OCxIF(1)
OCxRS(1)
Mode Select
3
Note 1: Where ‘x’ is shown, reference is made to the registers associated with the respective output compare channels,
1 through 5.
2: The OCFA pin controls the OC1-OC4 channels. The OCFB pin controls the OC5 channel.
0
1
OCTSEL
0
1
16
OCFA or OCFB(2)
Timer2
Timer3
Logic
Output
Enable
Timer3
Rollover