PIC16F877A-I/P Microchip Technology, PIC16F877A-I/P Datasheet - Page 210

• Manufacturer Part Number: PIC16F877A-I/P
• Description: IC MCU FLASH 8KX14 EE 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877A-I/P

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 368 B
• Interface Type: CCP/I2C/MSSP/SPI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• 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, DM163022, DV164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: PIC16F877AI/P

PICmicro MID-RANGE MCU FAMILY
14.5
DS31014A-page 14-8
PWM Mode
In Pulse Width Modulation (PWM) mode, the CCPx pin produces up to a 10-bit resolution PWM
output. Since the CCPx pin is multiplexed with the PORT data latch, the corresponding TRIS bit
must be cleared to make the CCPx pin an output.
Figure 14-3
For a step by step procedure on how to set up the CCP module for PWM operation, see Subsec-
tion
Figure 14-3: Simplified PWM Block Diagram
A PWM output
cycle). The frequency of the PWM is the inverse of the period (1/period).
Figure 14-4: PWM Output
Note:
14.5.3 “Set-up for PWM Operation.”
Note 1:
Timer2 Module
CCP Module
Clearing the CCPxCON register will force the CCPx PWM output latch to the default
low level. This is not the port I/O data latch.
shows a simplified block diagram of the CCP module in PWM mode.
(Figure
8-bit timer is concatenated with 2-bit internal Q clock or 2 bits of the prescaler to
create 10-bit time-base.
CCPRxH (Slave)
(DCxB9:DCxB2)
Comparator
CCPRxL
14-4) has a time-base (period) and a time that the output stays high (duty
Duty cycle registers
PR2
TMR2
Comparator
8
8
10
TMR2 = PR2 + 1, TMR2 forced to 0h
10
10
Duty Cycle =
DCxB9:DCxB0
(Note 1)
Period = PR2 + 1
Clear Timer, CCPx pin
and latch the Duty Cycle
TMR2 = Duty Cycle
CCPxCON<5:4>
(DCxB1:DCxB0)
TMR2 = PR2 + 1, TMR2 forced to 0h
R
S
Q
TRIS<y>
1997 Microchip Technology Inc.
CCPx