PIC18F452-I/PT Microchip Technology Inc., PIC18F452-I/PT Datasheet - Page 125

• Manufacturer Part Number: PIC18F452-I/PT
• Description: 44 PIN, 32 KB FLASH, 1536 RAM, 34 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F452-I/PT

• A/d Inputs: 8-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 32K Bytes
• Ram Size: 1.5K Bytes
• Speed: 40 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

14.5.3
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
TABLE 14-4:
TABLE 14-5:
© 2006 Microchip Technology Inc.
INTCON
PIR1
PIE1
IPR1
TRISC
TMR2
PR2
T2CON
CCPR1L
CCPR1H
CCP1CON
CCPR2L
CCPR2H
CCP2CON
Legend:
Note 1: The PSPIF, PSPIE and PSPIP bits are reserved on the PIC18F2X2 devices; always maintain these bits clear.
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
Name
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.
PWM Frequency
x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by PWM and Timer2.
PORTC Data Direction Register
Timer2 Module Register
Timer2 Module Period Register
Capture/Compare/PWM Register1 (LSB)
Capture/Compare/PWM Register1 (MSB)
Capture/Compare/PWM Register2 (LSB)
Capture/Compare/PWM Register2 (MSB)
SETUP FOR PWM OPERATION
GIE/GIEH PEIE/GIEL
PSPIE
PSPIP
PSPIF
Bit 7
—
—
—
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
(1)
(1)
(1)
REGISTERS ASSOCIATED WITH PWM AND TIMER2
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000
ADIF
ADIE
ADIP
Bit 6
—
—
TMR0IE
DC1B1
DC2B1
RCIE
RCIP
RCIF
2.44 kHz
Bit 5
0xFF
16
14
INT0IE
DC1B0
DC2B0
TXIE
TXIP
Bit 4
TXIF
9.77 kHz
0xFF
12
4
CCP1M3
CCP2M3
SSPIF
SSPIE
SSPIP
RBIE
Bit 3
39.06 kHz
3.
4.
5.
CCP1M2
CCP2M2
TMR0IF
CCP1IE
CCP1IP
CCP1IF
0xFF
Bit 2
10
1
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.
CCP1M1
CCP2M1
TMR2IE
TMR2IP
TMR2IF
INT0IF
156.25 kHz
Bit 1
0x3F
1
8
CCP1M0 --00 0000 --00 0000
CCP2M0 --00 0000 --00 0000
TMR1IF
TMR1IE 0000 0000 0000 0000
TMR1IP 0000 0000 0000 0000
RBIF
Bit 0
PIC18FXX2
312.50 kHz
0x1F
0000 000x 0000 000u
0000 0000 0000 0000
1111 1111 1111 1111
0000 0000 0000 0000
1111 1111 1111 1111
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
POR, BOR
1
7
Value on
DS39564C-page 123
416.67 kHz
0x17
All Other
6.58
Value on
RESETS
1