PIC18F1230 MICROCHIP [Microchip Technology], PIC18F1230 Datasheet - Page 117

• Manufacturer Part Number: PIC18F1230
• Description: 18/20/28-Pin, Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 13-4:
The PWM time base can be configured for four different
modes of operation:
• Free-Running mode
• Single-Shot mode
• Continuous Up/Down Count mode
• Continuous Up/Down Count mode with interrupts
© 2006 Microchip Technology Inc.
for double updates
F
OSC
/4
Comparator
PWM TIME BASE BLOCK DIAGRAM
PTPER Buffer
PTPER
1:1, 1:4, 1:16, 1:64
Prescaler
Zero Match
Period Match
PTMR Register
Comparator
Period Load
Update Disable (UDIS)
Advance Information
Period Match
Postscaler
Period Match
1:1-1:16
Zero Match
Zero Match
PTMOD1
PTMOD1
PTMOD0
PTMOD1
PTMOD0
PTMR Clock
Timer Reset
Up/Down
Direction
These
PTMOD1:PTMOD0 bits in the PTCON0 register. The
Free-Running mode produces edge-aligned PWM
generation. The Continuous Up/Down Count modes
produce center-aligned PWM generation. The Single-
Shot mode allows the PWM module to support pulse
control of certain Electronically Commutated Motors
(ECMs) and produces edge-aligned operation.
Interrupt
Control
Control
Control
Timer
Clock
PIC18F1230/1330
four
PTDIR
PTMR Clock
PTEN
modes
PTIF
are
Duty Cycle Load
selected
DS39758B-page 115
by
the