PIC18F64J11T-I/PT Microchip Technology, PIC18F64J11T-I/PT Datasheet - Page 175

• Manufacturer Part Number: PIC18F64J11T-I/PT
• Description: 16KB, Flash, 1024bytes-RAM, 51I/O, 8-bit Family,nanoWatt 64 TQFP 10x10x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F64J11T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 51
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA180018 - MODULE PLUG-IN 18F85J11AC162079 - HEADER MPLAB ICD2 18F85J90 64/80AC164327 - MODULE SKT FOR 64TQFP
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC18F64J11T-I/PTTR

16.4
In Pulse-Width Modulation (PWM) mode, the CCP2 pin
produces up to a 10-bit resolution PWM output. Since
the CCP2 pin is multiplexed with a PORTB, PORTC or
PORTE data latch, the appropriate TRIS bit must be
cleared to make the CCP2 pin an output.
Figure 16-4 shows a simplified block diagram of the
CCP1 module in PWM mode.
For a step-by-step procedure on how to set up the CCP
module for PWM operation, see Section 16.4.3
“Setup for PWM Operation”.
FIGURE 16-4:
 2010 Microchip Technology Inc.
Note 1:
Note:
CCPR1H (Slave)
Duty Cycle Registers
Comparator
CCPR1L
TMR2
PR2
Comparator
PWM Mode
The 8-bit TMR2 value is concatenated with the 2-bit
internal Q clock, or 2 bits of the prescaler, to create
the 10-bit time base.
Clearing the CCP2CON register will force
the RB3, RC1 or RE7 output latch
(depending on device configuration) to the
default low level. This is not the PORTB,
PORTC or PORTE I/O data latch.
(Note 1)
Clear Timer,
CCP1 pin and
latch D.C.
SIMPLIFIED PWM BLOCK
DIAGRAM
CCP1CON<5:4>
R
S
Q
TRISC<2>
RC2/CCP1
PIC18F85J11 FAMILY
A PWM output (Figure 16-5) has a time base (period)
and a time that the output stays high (duty cycle). The
frequency of the PWM is the inverse of the period
(1/period).
FIGURE 16-5:
16.4.1
The PWM period is specified by writing to the PR2
register. The PWM period can be calculated using the
following formula:
EQUATION 16-1:
PWM frequency is defined as 1/[PWM period].
When TMR2 is equal to PR2, the following three events
occur on the next increment cycle:
• TMR2 is cleared
• The CCP2 pin is set (exception: if PWM duty
• The PWM duty cycle is latched from CCPR2L into
cycle = 0%, the CCP2 pin will not be set)
CCPR2H
Note:
PWM Period = (PR2) + 1] • 4 • T
TMR2 = PR2
Duty Cycle
PWM PERIOD
The Timer2 postscalers (see Section 14.0
“Timer2 Module”) are not used in the
determination of the PWM frequency. The
postscaler could be used to have a servo
update rate at a different frequency than
the PWM output.
Period
TMR2 = Duty Cycle
(TMR2 Prescale Value)
PWM OUTPUT
TMR2 = PR2
DS39774D-page 175
OSC
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