DSPIC30F2023 Microchip Technology Inc., DSPIC30F2023 Datasheet - Page 104

• Manufacturer Part Number: DSPIC30F2023
• Description: 28/44-pin Dspic30f1010/202x Enhanced Flash Smps 16-bit Digital Signal Controller
• Manufacturer: Microchip Technology Inc.

dsPIC30F1010/202X
11.1
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.
11.2
When control bits OCM<2:0> (OCxCON<2:0>) = 001,
010 or 011, the selected output compare channel is
configured for one of three simple Output Compare
Match modes:
• Compare forces I/O pin low
• Compare forces I/O pin high
• Compare toggles I/O pin
The OCxR register is used in these modes. The OCxR
register is loaded with a value and is compared to the
selected incrementing timer count. When a compare
occurs, one of these Compare Match modes occurs. If
the counter resets to zero before reaching the value in
OCxR, the state of the OCx pin remains unchanged.
11.3
When control bits OCM<2:0> (OCxCON<2:0>) = 100
or 101, the selected output compare channel is config-
ured for one of two Dual Output Compare modes,
which are:
• Single Output Pulse mode
• Continuous Output Pulse mode
11.3.1
For the user to configure the module for the generation
of a single output pulse, the following steps are
required (assuming the timer is off):
• Determine instruction cycle time T
• Calculate desired pulse width value based on T
• Calculate time to start pulse from timer start value
• Write pulse width start and stop times into OCxR
• Set timer period register to value equal to, or
• Set OCM<2:0> = 100.
• Enable timer, TON (TxCON<15>) = 1.
To initiate another single pulse, issue another write to
set OCM<2:0> = 100.
DS70178C-page 102
of 0x0000.
and OCxRS compare registers (x denotes
channel 1, 2).
greater than, value in OCxRS compare register.
Timer2 and Timer3 Selection Mode
Simple Output Compare Match
Mode
Dual Output Compare Match Mode
SINGLE PULSE MODE
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Preliminary
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11.3.2
For the user to configure the module for the generation
of a continuous stream of output pulses, the following
steps are required:
• Determine instruction cycle time T
• Calculate desired pulse value based on T
• Calculate timer to start pulse width from timer start
• Write pulse width start and stop times into OCxR
• Set timer period register to value equal to, or
• Set OCM<2:0> = 101.
• Enable timer, TON (TxCON<15>) = 1.
11.4
When control bits OCM<2:0> (OCxCON<2:0>) = 110
or 111, the selected output compare channel is config-
ured for the PWM mode of operation. When configured
for the PWM mode of operation, OCxR is the Main latch
(read-only) and OCxRS is the secondary latch. This
enables glitchless PWM transitions.
The user must perform the following steps in order to
configure the output compare module for PWM
operation:
1.
2.
3.
4.
value of 0x0000.
and OCxRS (x denotes channel 1, 2) compare
registers, respectively.
greater than, value in OCxRS compare register.
Set the PWM period by writing to the appropriate
period register.
Set the PWM duty cycle by writing to the OCxRS
register.
Configure the output compare module for PWM
operation.
Set the TMRx prescale value and enable the
Timer, TON (TxCON<15>) = 1.
Simple PWM Mode
CONTINUOUS PULSE MODE
© 2006 Microchip Technology Inc.
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