AC162078 Microchip Technology, AC162078 Datasheet - Page 133
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AC162078
Manufacturer Part Number
AC162078
Description
HEADER INTRFC MPLAB ICD2 18F1330
Manufacturer
Microchip Technology
Datasheet
1.AC162078.pdf
(318 pages)
Specifications of AC162078
Accessory Type
Transition Header
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
ICD2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Not applicable / Not applicable
Available stocks
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Part Number:
AC162078
Manufacturer:
MICROCHIP
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FIGURE 14-14:
14.6.4
Center-aligned PWM signals are produced by the
module when the PWM time base is configured in a
Continuous Up/Down Count mode (see Figure 14-15).
The PWM compare output is driven to the active state
when the value of the Duty Cycle register matches the
value of PTMR and the PWM time base is counting
downwards (PTDIR = 1). The PWM compare output
will be driven to the inactive state when the PWM time
base is counting upwards (PTDIR = 0) and the value in
the PTMR register matches the duty cycle value. If the
value in a particular Duty Cycle register is zero, then
the output on the corresponding PWM pin will be
FIGURE 14-15:
2009 Microchip Technology Inc.
Start of
First
PWM
Period
PTPER
Cycle
Duty
0
CENTER-ALIGNED PWM
PWM Output
PTMR Value
DUTY CYCLE UPDATE TIMES IN CONTINUOUS UP/DOWN COUNT MODE WITH
DOUBLE UPDATES
START OF CENTER-ALIGNED PWM
PTMR
Value
Duty Cycle
Period/2
Duty Cycle Value Loaded from Buffer Register
Period
inactive for the entire PWM period. In addition, the
output on the PWM pin will be active for the entire PWM
period if the value in the Duty Cycle register is equal to
or greater than the value in the PTPER register.
Note:
New Values Written to Duty Cycle Buffer
PIC18F1230/1330
When the PWM is started in Center-
Aligned mode, the PWM Time Base
Period register (PTPER) is loaded into the
PWM Time Base register (PTMR) and the
PTMR is configured automatically to start
down counting. This is done to ensure that
all the PWM signals don’t start at the same
time.
Period
DS39758D-page 133
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