2010 Microchip Technology Inc.
DS70138G-page 85
dsPIC30F3014/4013
13.0
OUTPUT COMPARE MODULE
This section describes the output compare module and
associated operational modes. The features provided
by this module are useful in applications requiring
operational modes, such as:
Generation of Variable Width Output Pulses
Power Factor Correction
Figure 13-1 depicts a block diagram of the output
compare module.
The key operational features of the output compare
module include:
Timer2 and Timer3 Selection mode
Simple Output Compare Match mode
Dual Output Compare Match mode
Simple PWM mode
Output Compare During Sleep and Idle modes
Interrupt on Output Compare/PWM Event
These operating modes are determined by setting the
appropriate bits in the 16-bit OCxCON SFR (where
x = 1,2,3,...,N). The dsPIC DSC devices contain up to
8 compare channels (i.e., the maximum value of N is 8).
The dsPIC30F3014 device contains
2 compare
channels while the dsPIC30F4013 device contains
4 compare channels.
OCxRS and OCxR in Figure 13-1 represent the Dual
Compare registers. In the Dual Compare mode, the
OCxR register is used for the first compare and OCxRS
is used for the second compare.
13.1
Timer2 and Timer3 Selection Mode
Each output compare channel can select between one
of two 16-bit timers: Timer2 or Timer3.
The selection of the timers is controlled by the OCTSEL
bit (OCxCON<3>). Timer2 is the default timer resource
for the output compare module.
FIGURE 13-1:
OUTPUT COMPARE MODE BLOCK DIAGRAM
Note:
This data sheet summarizes features of
this group of dsPIC30F devices and is not
intended to be a complete reference
source. For more information on the CPU,
peripherals,
register
descriptions
and
general device functionality, refer to the
“dsPIC30F Family Reference Manual”
(DS70046).
OCxR
Comparator
Output
Logic
Q
S
R
OCM<2:0>
Output
OCx
Set Flag bit
OCxIF
OCxRS
Mode Select
3
Note:
Where ‘x’ is shown, reference is made to the registers associated with the respective output compare
channels, 1 through N.
OCFA
OCTSEL
01
T2P2_MATCH
TMR2<15:0
TMR3<15:0>
T3P3_MATCH
From GP
(for x = 1, 2, 3 or 4)
or OCFB
(for x = 5, 6, 7 or 8)
01
Timer Module
Enable
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