PIC16F870-I/SP Microchip Technology Inc., PIC16F870-I/SP Datasheet - Page 61

• Manufacturer Part Number: PIC16F870-I/SP
• Description: 28 PIN, 7 KB FLASH, 128 RAM, 22 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F870-I/SP

• A/d Inputs: 5-Channel, 10-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 64 Bytes
• Input Output: 22
• Interface: USART
• 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

8.4.3
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
3.
4.
5.
TABLE 8-2:
TABLE 8-3:
 2003 Microchip Technology Inc.
0Bh,8Bh,
10Bh, 18Bh
0Ch
8Ch
87h
0Eh
0Fh
10h
15h
16h
17h
Legend:
Note 1:
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.
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.
PWM Frequency
x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by Capture and Timer1.
The PSP is not implemented on the PIC16F870; always maintain these bits clear.
INTCON
PIR1
PIE1
TRISC
TMR1L
TMR1H
T1CON
CCPR1L
CCPR1H
CCP1CON
SETUP FOR PWM OPERATION
Name
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz
REGISTERS ASSOCIATED WITH CAPTURE, COMPARE, AND TIMER1
PORTC Data Direction Register
Holding Register for the Least Significant Byte of the 16-bit TMR1 Register
Holding Register for the Most Significant Byte of the 16-bit TMR1 Register
Capture/Compare/PWM Register1 (LSB)
Capture/Compare/PWM Register1 (MSB)
PSPIF
PSPIE
Bit 7
GIE
—
—
(1)
(1)
ADIF
ADIE
Bit 6
PEIE
—
—
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON --00 0000 --uu uuuu
CCP1X
RCIE
RCIF
1.22 kHz
Bit 5
T0IE
0xFFh
16
10
CCP1Y
INTE
TXIE
Bit 4
TXIF
4.88 kHz
0xFFh
10
4
CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000
RBIE
Bit 3
—
—
19.53 kHz
0xFFh
10
CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000
CCP1IF
1
Bit 2
T0IF
TMR2IF
78.12kHz
PIC16F870/871
Bit 1
INTF
0x3Fh
1
8
TMR1IF 0000 -000 0000 -000
RBIF
Bit 0
156.3 kHz
0x1Fh
0000 000x 0000 000u
1111 1111 1111 1111
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
1
7
POR, BOR
Value on:
DS30569B-page 59
208.3 kHz
0x17h
6.5
Value on
RESETS
all other
1