PIC18F4431-E/P Microchip Technology, PIC18F4431-E/P Datasheet - Page 146

• Manufacturer Part Number: PIC18F4431-E/P
• Description: IC MCU FLASH 8KX16 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/P

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: EUSART, I2C, SPI, SSP
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 1 x 8
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 9 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DVA18XP400 - DEVICE ADAPTER 18F4220 PDIP 40LDACICE0206 - ADAPTER MPLABICE 40P 600 MIL
• Lead Free Status / Rohs Status: Details

PIC18F2331/2431/4331/4431
16.3
In Capture mode, CCPR1H:CCPR1L captures the
16-bit value of the TMR1 register when an event
occurs on pin RC2/CCP1. An event is defined as
one of the following:
• every falling edge
• every rising edge
• every 4th rising edge
• every 16th rising edge
The event is selected by control bits, CCP1M<3:0>
(CCP1CON<3:0>). When a capture is made, the
interrupt request flag bit, CCP1IF (PIR1<2>), is set; it
must be cleared in software. If another capture occurs
before the value in register CCPR1 is read, the old
captured value is overwritten by the new captured value.
16.3.1
In Capture mode, the RC2/CCP1 pin should be
configured as an input by setting the TRISC<2> bit.
16.3.2
Timer1 must be running in Timer mode or Synchro-
nized Counter mode to be used with the capture
feature. In Asynchronous Counter mode, the capture
operation may not work.
FIGURE 16-1:
DS39616D-page 146
Note:
Capture Mode
CCP PIN CONFIGURATION
If the RC2/CCP1 pin is configured as an
output, a write to the port can cause a
capture condition.
TIMER1 MODE SELECTION
CAPTURE MODE OPERATION BLOCK DIAGRAM
CCP1 Pin
CCP2 Pin
Edge Detect
Edge Detect
Qs
Qs
Prescaler
 1, 4, 16
 1, 4, 16
Prescaler
and
and
CCP1CON<3:0>
CCP2CON<3:0>
Set CCP1IF Flag bit
Set CCP2IF Flag bit
16.3.3
When the Capture mode is changed, a false capture
interrupt may be generated. The user should keep bit,
CCP1IE (PIE1<2>), clear to avoid false interrupts and
should clear the flag bit, CCP1IF, following any such
change in operating mode.
16.3.4
There are four prescaler settings specified by bits
CCP1M<3:0>. Whenever the CCP module is turned off,
or the CCP module is not in Capture mode, the
prescaler counter is cleared. This means that any
Reset will clear the prescaler counter.
Switching from one capture prescaler to another may
generate an interrupt. Also, the prescaler counter will
not be cleared, therefore, the first capture may be from
a non-zero prescaler.
mended method for switching between capture
prescalers. This example also clears the prescaler
counter and will not generate the “false” interrupt.
EXAMPLE 16-1:
CLRF
MOVLW
MOVWF
TMR1
Enable
TMR1
Enable
CCPR2H
CCPR1H
CCP1CON
NEW_CAPT_PS
CCP1CON
TMR1H
TMR1H
SOFTWARE INTERRUPT
CCP PRESCALER
CCPR2L
CCPR1L
TMR1L
TMR1L
Example 16-1
CHANGING BETWEEN
CAPTURE PRESCALERS
 2010 Microchip Technology Inc.
; Turn CCP module off
; Load WREG with the
; new prescaler mode
; value and CCP ON
; Load CCP1CON with
; this value
shows the recom-