PIC16F946T-I/PT Microchip Technology, PIC16F946T-I/PT Datasheet - Page 187

• Manufacturer Part Number: PIC16F946T-I/PT
• Description: Microcontroller
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F946T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• 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: MA160011 - DAUGHTER BOARD PICDEM LCD 16F91X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

15.1
In Capture mode, CCPR1H:CCPR1L captures the
16-bit value of the TMR1 register when an event occurs
on pin RC5/T1CKI/CCP1/SEG10. An event is defined
as one of the following:
• Every falling edge
• Every rising edge
• Every 4th rising edge
• Every 16th rising edge
The type of event is configured by control bits
CCP1M<3:0> (CCPxCON<3:0>). When a capture is
made, the interrupt request flag bit CCP1IF (PIR1<2>)
is set. The interrupt flag 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 value.
15.1.1
In Capture mode, the RC5/T1CKI/CCP1/SEG10 pin
should be configured as an input by setting the
TRISC<5> bit.
FIGURE 15-3:
15.1.2
Timer1 must be running in Timer mode, or Synchro-
nized Counter mode, for the CCP module to use the
capture feature. In Asynchronous Counter mode, the
capture operation may not work.
15.1.3
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.
© 2005 Microchip Technology Inc.
CCP1/SEG10
RC5/T1CKI/
Note:
pin
Capture Mode
Qs
edge detect
CCP PIN CONFIGURATION
If the RC5/T1CKI/CCP1/SEG10 pin is
configured as an output, a write to the port
can cause a capture condition.
TIMER1 MODE SELECTION
SOFTWARE INTERRUPT
Prescaler
1, 4, 16
and
CCP1CON<3:0>
Set Flag bit CCP1IF
CAPTURE MODE
OPERATION BLOCK
DIAGRAM
(PIR1<2>)
Capture
Enable
CCPR1H
TMR1H
CCPR1L
TMR1L
Preliminary
15.1.4
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. 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. Example 15-1 shows the recom-
mended method for switching between capture pre-
scalers. This example also clears the prescaler counter
and will not generate the “false” interrupt.
EXAMPLE 15-1:
CLRF
MOVLW
MOVWF
CCP1CON
NEW_CAPT_PS ; Load the W reg with
CCP1CON
CCP PRESCALER
CHANGING BETWEEN
CAPTURE PRESCALERS
; Turn CCP module off
; the new prescaler
; move value and CCP ON
; Load CCP1CON with this
; value
PIC16F946
DS41265A-page 185