PIC16F872-I/SP Microchip Technology Inc., PIC16F872-I/SP Datasheet - Page 51

• Manufacturer Part Number: PIC16F872-I/SP
• Description: 28 PIN, 7 KB FLASH, 128 RAM, 22 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F872-I/SP

• A/d Inputs: 5-Channel, 10-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 64 Bytes
• Input Output: 22
• Interface: I2C/SPI
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

8.3.3
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
TABLE 8-3:
TABLE 8-4:
© 2006 Microchip Technology Inc.
0Bh,8Bh,
10Bh, 18Bh
0Ch
8Ch
87h
11h
92h
12h
15h
16h
17h
Legend:
Note 1: These bits are reserved; always maintain clear.
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
Address
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.
x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by PWM and Timer2.
PWM Frequency
SETUP FOR PWM OPERATION
INTCON
PIR1
PIE1
TRISC
TMR2
PR2
T2CON
CCPR1L
CCPR1H
CCP1CON
Name
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz
REGISTERS ASSOCIATED WITH PWM AND TIMER2
PORTC Data Direction Register
Timer2 Modules Register
Timer2 Module Period Register
Capture/Compare/PWM Register1 (LSB)
Capture/Compare/PWM Register1 (MSB)
Bit 7
GIE
(1)
(1)
—
—
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000
PEIE
ADIF
ADIE
Bit 6
—
1.22 kHz
TMR0IE
CCP1X
FFh
Bit 5
16
10
(1)
(1)
CCP1Y
4.88 kHz
INTE
Bit 4
(1)
(1)
FFh
10
4
CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000
SSPIF
SSPIE
3.
4.
5.
RBIE
Bit 3
19.53 kHz
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.
FFh
10
1
TMR0IF
CCP1IF
CCP1IE
Bit 2
78.12kHz
TMR2IF
TMR2IE
3Fh
1
8
Bit 1
INTF
PIC16F872
TMR1IE r0rr 0000 0000 0000
TMR1IF 0000 0000 0000 0000
156.3 kHz
RBIF
Bit 0
1Fh
1
7
DS30221C-page 49
0000 000x 0000 000u
1111 1111 1111 1111
0000 0000 0000 0000
1111 1111 1111 1111
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
Value on:
POR,
BOR
208.3 kHz
17h
5.5
1
Value on
RESETS
all other