PIC18F4431-E/PT Microchip Technology, PIC18F4431-E/PT Datasheet - Page 187

• Manufacturer Part Number: PIC18F4431-E/PT
• Description: IC MCU FLASH 8KX16 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/PT

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 40MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 17-4:
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
These
PTMOD1:PTMOD0 bits in the PTCON0 register. The
Free Running mode produces edge-aligned PWM
generation. The up/down counting 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.
 2003 Microchip Technology Inc.
for double updates
four
F
OSC
modes
/4
PWM TIME BASE BLOCK DIAGRAM
Comparator
Zero
match
Period
match
PTPER Buffer
are
1:1, 1:4, 1:16, 1:64
PTPER
Prescaler
PTMR Register
selected
Comparator
Period load
Update disable (UDIS)
Period match
PIC18F2331/2431/4331/4431
by
Period match
PTMOD1
Zero match
Postscaler
1:1 - 1:16
PTMOD1
PTMOD0
PTMOD1
PTMOD0
Zero match
Preliminary
the
Timer RESET
Direction
Up/Down
Control
Interrupt
Control
Control
Timer
Clock
PTMR Clock
PTDIR
PTEN
PTMR clock
PTIF
Duty Cycle Load
DS39616B-page 185