MA180025 Microchip Technology, MA180025 Datasheet - Page 179

MODULE PLUG-IN PIC18F87J90 PIM

MA180025

Manufacturer Part Number
MA180025
Description
MODULE PLUG-IN PIC18F87J90 PIM
Manufacturer
Microchip Technology
Series
PIC®r
Datasheets

Specifications of MA180025

Accessory Type
Plug-In Module (PIM) - PIC18F87J90
Product
Microcontroller Modules
Silicon Manufacturer
Microchip
Core Architecture
PIC
Core Sub-architecture
PIC18
Silicon Core Number
PIC18F
Silicon Family Name
PIC18FxxJxx
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
PICDEM LCD 2 Demonstration Board (DM163030)
For Use With
DM163030 - KIT DEV PICDEM LCD2
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MA180025
Manufacturer:
Microchip Technology
Quantity:
135
Part Number:
MA180025
Manufacturer:
MICROCHIP
Quantity:
12 000
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 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 RC1 or RE7 output latch (depending
on the device configuration) to the default
low level. This is not the 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
PIC18F87J90 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 13.0
“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
DS39933D-page 179
OSC

Related parts for MA180025