PIC18F4431-E/P Microchip Technology, PIC18F4431-E/P Datasheet - Page 150

• Manufacturer Part Number: PIC18F4431-E/P
• Description: IC MCU FLASH 8KX16 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/P

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• 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
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• 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: 1 x 8
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• 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 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DVA18XP400 - DEVICE ADAPTER 18F4220 PDIP 40LDACICE0206 - ADAPTER MPLABICE 40P 600 MIL
• Lead Free Status / Rohs Status: Details

PIC18F2331/2431/4331/4431
The CCPR1H register and a 2-bit internal latch are
used to double buffer the PWM duty cycle. This double
buffering is essential for glitchless PWM operation.
When the CCPR1H and 2-bit latch match TMR2,
concatenated with an internal 2-bit Q clock or two bits
of the TMR2 prescaler, the CCP1 pin is cleared. The
maximum PWM resolution (bits) for a given PWM
frequency is given by the following equation:
EQUATION 16-3:
TABLE 16-3:
TABLE 16-4:
DS39616D-page 150
INTCON
PIR1
PIE1
IPR1
TRISC
TMR2
PR2
T2CON
CCPR1L
CCPR1H
CCP1CON
CCPR2L
CCPR2H
CCP2CON
Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by PWM and
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
Note:
Name
PWM Resolution (max) =
PWM Frequency
Timer2.
If the PWM duty cycle value is longer than
the PWM period, the CCP1 pin will not be
cleared.
PORTC Data Direction Register
Timer2 Register
Timer2 Period Register
Capture/Compare/PWM Register 1 Low Byte
Capture/Compare/PWM Register 1 High Byte
Capture/Compare/PWM Register 2 Low Byte
Capture/Compare/PWM Register 2 High Byte
GIE/GIEH PEIE/GIEL
Bit 7
—
—
—
—
—
—
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
REGISTERS ASSOCIATED WITH PWM AND TIMER2
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0
ADIF
ADIE
ADIP
Bit 6
—
—
log
log(2)


F
2.44 kHz
F
PWM
OSC
FFh
16
10
TMR0IE
DC1B1
DC2B1
RCIE
RCIP
RCIF
Bit 5


bits
9.77 kHz
DC1B0
DC2B0
INT0IE
Bit 4
TXIF
TXIE
TXIP
FFh
10
4
CCP2M3 CCP2M2 CCP2M1 CCP2M0
CCP1M3 CCP1M2 CCP1M1 CCP1M0
SSPIF
SSPIE
SSPIP
RBIE
39.06 kHz
Bit 3
16.5.3
The following steps should be taken when configuring
the CCP1 module for PWM operation:
1.
2.
3.
4.
5.
FFh
10
1
Set the PWM period by writing to the PR2 register.
Set the PWM duty cycle by writing to the CCPR1L
register and CCP1CON<5:4> bits.
Make the CCP1 pin an output by clearing the
TRISC<2> bit.
Set the TMR2 prescale value and enable Timer2
by writing to T2CON.
Configure the CCP1 module for PWM operation.
TMR0IF
CCP1IE
CCP1IP
CCP1IF
Bit 2
SETUP FOR PWM OPERATION
156.25 kHz
3Fh
1
8
TMR2IF
TMR2IE
TMR2IP
INT0IF
Bit 1
 2010 Microchip Technology Inc.
312.50 kHz
TMR1IF
TMR1IE
TMR1IP
1Fh
RBIF
Bit 0
1
7
Reset Values
416.67 kHz
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