PIC16F785-I/SO Microchip Technology, PIC16F785-I/SO Datasheet - Page 58

• Manufacturer Part Number: PIC16F785-I/SO
• Description: IC PIC MCU FLASH 2KX14 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 20-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232/USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164120, DM163029
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SO1-1 - SOCKET TRANS ICE 20DIP TO 20SOICXLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC162060 - HEADER INTRFC MPLAB ICD2 20PINAC164039 - MODULE SKT PROMATE II 20DIP/SOIC
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F785
8.1
In Capture mode, CCPR1H:CCPR1L captures the
16-bit value of the TMR1 register when an event occurs
on pin RC5/CCP1. An event is defined as one of the
following and is configured by CCP1CON<3:0>:
• Every falling edge
• Every rising edge
• Every 4th rising edge
• Every 16th rising edge
When a capture is made, the interrupt request flag bit
CCP1IF (PIR1<5>) 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 captured value.
8.1.1
In Capture mode, the RC5/CCP1 pin should be config-
ured as an input by setting the TRISC<5> bit.
FIGURE 8-1:
8.1.2
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.
8.1.3
When the Capture mode is changed, a false capture
interrupt may be generated. The user should keep bit
CCP1IE (PIE1<5>) clear to avoid false interrupts and
should clear the flag bit CCP1IF (PIR1<5>) following
any such change in Operating mode.
DS41249A-page 56
RC5/CCP1
pin
Note:
Capture Mode
Edge Detect
If the RC5/CCP1 pin is configured as an
output, a write to the port can cause a
capture condition.
Q’s
CCP1 PIN CONFIGURATION
Prescaler
TIMER1 MODE SELECTION
SOFTWARE INTERRUPT
1, 4, 16
and
CCP1CON<3:0>
Set Flag bit CCP1IF
CAPTURE MODE
OPERATION BLOCK
DIAGRAM
(PIR1<5>)
Capture
Enable
CCPR1H
TMR1H
CCPR1L
TMR1L
Preliminary
8.1.4
There are four prescaler settings specified by bits
CCP1M<3:0> (CCP1CON<3:0>). Whenever the CCP
module is turned off, or the CCP module is not in Cap-
ture 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 8-1 shows the recom-
mended method for switching between capture
prescalers. This example also clears the prescaler
counter and will not generate the “false” interrupt.
EXAMPLE 8-1:
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
 2004 Microchip Technology Inc.