dsPIC33FJ32MC204 Microchip Technology, dsPIC33FJ32MC204 Datasheet - Page 143

• Manufacturer Part Number: dsPIC33FJ32MC204
• Description: (dsPIC33FJ16MC304 / dsPIC33FJ32MC20x) 16-bit Microcontrollers
• Manufacturer: Microchip Technology

12.0
The input capture module is useful in applications
requiring frequency (period) and pulse measurement.
The
dsPIC33FJ16MC304 devices support up to eight input
capture channels.
The input capture module captures the 16-bit value of
the selected Time Base register when an event occurs
at the ICx pin. The events that cause a capture event
are listed below in three categories:
1.
2.
FIGURE 12-1:
© 2007 Microchip Technology Inc.
Note:
- Capture timer value on every falling edge of
- Capture timer value on every rising edge of
Note: An ‘x’ in a signal, register or bit name denotes the number of the capture channel.
ICx Pin
Simple Capture Event modes:
input at ICx pin
input at ICx pin
Capture timer value on every edge (rising and
falling)
INPUT CAPTURE
This data sheet summarizes the features
of
dsPIC33FJ16MC304 devices. It is not
intended to be a comprehensive reference
source. To complement the information in
this data sheet, refer to the “dsPIC33F
Family Reference Manual”. Please see
the Microchip web site (www.micro-
chip.com) for the latest dsPIC33F Family
Reference Manual sections.
dsPIC33FJ32MC202/204
the
Prescaler
(1, 4, 16)
Counter
3
dsPIC33FJ32MC202/204
INPUT CAPTURE BLOCK DIAGRAM
System Bus
ICxCON
ICM<2:0> (ICxCON<2:0>)
ICOV, ICBNE (ICxCON<4:3>)
Mode Select
Edge Detection Logic
Clock Synchronizer
ICxI<1:0>
and
and
and
Preliminary
(in IFSn Register)
Set Flag ICxIF
Interrupt
Logic
3.
Each input capture channel can select one of two
16-bit timers (Timer2 or Timer3) for the time base.
The selected timer can use either an internal or
external clock.
Other operational features include:
• Device wake-up from capture pin during CPU
• Interrupt on input capture event
• 4-word FIFO buffer for capture values
• Use of input capture to provide additional sources
- Capture timer value on every 4th rising edge
- Capture timer value on every 16th rising
Sleep and Idle modes
- Interrupt optionally generated after 1, 2, 3 or
of external interrupts
Prescaler Capture Event modes:
of input at ICx pin
edge of input at ICx pin
4 buffer locations are filled
FIFO
Logic
R/W
From 16-bit Timers
TMR2 TMR3
1
ICxBUF
16
0
DS70283B-page 141
16
ICTMR
(ICxCON<7>)