PIC16F818-I/P Microchip Technology, PIC16F818-I/P Datasheet - Page 71

• Manufacturer Part Number: PIC16F818-I/P
• Description: IC MCU FLASH 1KX14 18-DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F818-I/P

• Program Memory Type: FLASH
• Program Memory Size: 1.75KB (1K x 14)
• Package / Case: 18-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: I2C/SPI/SSP
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ACICE0202 - ADAPTER MPLABICE 18P 300 MILAC164010 - MODULE SKT PROMATEII DIP/SOIC
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The maximum PWM resolution (bits) for a given PWM
frequency is given by the following formula.
EQUATION 9-3:
TABLE 9-3:
TABLE 9-4:
 2004 Microchip Technology Inc.
0Bh,8Bh
10Bh,18Bh
0Ch
8Ch
86h
11h
92h
12h
15h
16h
17h
Legend:
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
Address
Note:
Resolution
INTCON
PIR1
PIE1
TRISB
TMR2
PR2
T2CON
CCPR1L
CCPR1H
CCP1CON
x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by PWM and Timer2.
If the PWM duty cycle value is longer than
the PWM period, the CCP1 pin will not be
cleared.
Name
PWM Frequency
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz
REGISTERS ASSOCIATED WITH PWM AND TIMER2
=
PORTB Data Direction Register
Timer2 Module Register
Timer2 Module Period Register
Capture/Compare/PWM Register 1 (LSB)
Capture/Compare/PWM Register 1 (MSB)
Bit 7
GIE
—
—
—
—
log
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000
(
log(2)
PEIE
ADIF
ADIE
Bit 6
F
F
—
PWM
OSC
)
TMR0IE
CCP1X
bits
Bit 5
—
—
1.22 kHz 4.88 kHz 19.53 kHz 78.12 kHz 156.3 kHz 208.3 kHz
0xFF
CCP1Y
16
10
INTE
Bit 4
—
—
CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000
0xFF
SSPIF
SSPIE
RBIE
Bit 3
10
4
9.3.3
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
3.
4.
5.
Note:
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
TRISB<x> bit.
Set the TMR2 prescale value and enable Timer2
by writing to T2CON.
Configure the CCP1 module for PWM operation.
TMR0IF
CCP1IF
CCP1IE
Bit 2
0xFF
10
1
SETUP FOR PWM OPERATION
The TRISB bit (2 or 3) is dependant upon
the
(CCPMX).
TMR2IF
TMR2IE
PIC16F818/819
INTF
Bit 1
setting
0x3F
1
8
TMR1IF -0-- 0000 -0-- 0000
TMR1IE -0-- 0000 -0-- 0000
RBIF
Bit 0
of
configuration
0x1F
0000 000x 0000 000u
1111 1111 1111 1111
0000 0000 0000 0000
1111 1111 1111 1111
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
POR, BOR
Value on
1
7
DS39598E-page 69
0x17
bit
Value on
all other
5.5
Resets
1
12