PIC18F4431-I/PT Microchip Technology, PIC18F4431-I/PT Datasheet - Page 191

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

Specifications of PIC18F4431-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 16KB (8K x 16)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: PIC
• Core Size: 8-Bit
• 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
• 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
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: EUSART/I2C/SPI/SSP
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 9-ch x 10-bit
• Package: 44TQFP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TABLE 17-1:
17.3.5
The match output of PTMR can optionally be
post-scaled through a 4-bit postscaler (which gives a
1:1 to 1:16 scaling inclusive) to generate an interrupt.
The postscaler counter is cleared when any of the
following occurs:
• Write to the PTMR register
• Write to the PTCON register
• Any device Reset
The PTMR register is not cleared when PTCON is
written.
FIGURE 17-5:
 2003 Microchip Technology Inc.
PTMR_INT_REQ
PTMR_INT_REQ
Minimum PWM Frequencies vs. Prescaler Value
A: PRESCALER = 1:1
B: PRESCALER = 1:4
Note 1: PWM Time Base Period register, PTPER, is loaded with the value FFFh for this example.
Prescale
PTIF bit
PTMR
PTIF bit
1:16
1:64
for F
F
1:1
1:4
PTMR
OSC
/4
PWM TIME BASE POSTSCALER
CYC
Qc
Q1
= 10 MIPS, (PTPER = 0FFFh)
MINIMUM PWM FREQUENCY
Edge-aligned
Qc
FFEh
Frequency
Q2
FFEh
PWM TIME BASE INTERRUPT TIMING, FREE RUNNING MODE
2441 Hz
153 Hz
610 Hz
38 Hz
PWM
Qc
Q3
Qc
Q4
Qc
Q1
Center-aligned
Frequency
1
1
Qc
1221 Hz
Q2
305 Hz
76 Hz
19 Hz
FFFh
PWM
FFFh
PIC18F2331/2431/4331/4431
Qc
Q3
Qc
Preliminary
Q4
Qc
Q1
Q4
Qc
Q2
Q4
000h
17.4
The PWM timer can generate interrupts based on the
modes of operation selected by PTMOD<1:0> bits and
the postscaler bits (PTOPS<3:0>).
17.4.1
When the PWM time base is in the Free Running mode
(PTMOD<1:0> = 00), an interrupt event is generated
each time a match with the PTPER register occurs. The
PTMR register is reset to zero in the following clock
edge.
Using a postscaler selection other than 1:1 will reduce
the frequency of interrupt events.
000h
Qc
Q3
Qc
Q4
PWM Time Base Interrupts
INTERRUPTS IN FREE RUNNING
MODE
Qc
Q1
Qc
Q2
001h
001h
Qc
Q3
Qc
Q4
Qc
Q1
DS39616B-page 189
Qc
Q2
002h
002h
Qc
Q3
Qc
Q4