Microchip Technology DV320032 Data Sheet
2012-2013 Microchip Technology Inc.
DS60001185C-page 187
PIC32MX330/350/370/430/450/470
15.0 INPUT CAPTURE
The Input Capture module is useful in applications
requiring frequency (period) and pulse measurement.
The Input Capture module captures the 16-bit or 32-bit
value of the selected Time Base registers when an
event occurs at the ICx pin. The following events cause
capture events:
• Simple capture event modes:
requiring frequency (period) and pulse measurement.
The Input Capture module captures the 16-bit or 32-bit
value of the selected Time Base registers when an
event occurs at the ICx pin. The following events cause
capture events:
• Simple capture event modes:
- Capture timer value on every falling edge of
input at ICx pin
- Capture timer value on every rising edge of
input at ICx pin
- Capture timer value on every edge (rising
and falling)
- Capture timer value on every edge (rising
and falling), specified edge first.
• Prescaler capture event modes:
- Capture timer value on every 4th rising edge of
input at ICx pin
- Capture timer value on every 16th rising edge of
input at ICx pin
Each input capture channel can select between one of
two 16-bit timers (Timer2 or Timer3) for the time base,
or two 16-bit timers (Timer2 and Timer3) together to
form a 32-bit timer. The selected timer can use either
an internal or external clock.
Other operational features include:
• Device wake-up from capture pin during CPU
two 16-bit timers (Timer2 or Timer3) for the time base,
or two 16-bit timers (Timer2 and Timer3) together to
form a 32-bit timer. The selected timer can use either
an internal or external clock.
Other operational features include:
• Device wake-up from capture pin during CPU
Sleep and Idle modes
• Interrupt on input capture event
• 4-word FIFO buffer for capture values
• 4-word FIFO buffer for capture values
Interrupt optionally generated after 1, 2, 3, or 4
buffer locations are filled
buffer locations are filled
• Input capture can also be used to provide
additional sources of external interrupts
FIGURE 15-1:
INPUT CAPTURE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the PIC32MX330/350/370/430/450/
470 family of devices. It is not intended to
be a comprehensive reference source.
To complement the information in this
data sheet, refer to Section 15. “Input
Capture” (DS60001122) of the “PIC32
Family Reference Manual”, which is
available from the Microchip web site
(
470 family of devices. It is not intended to
be a comprehensive reference source.
To complement the information in this
data sheet, refer to Section 15. “Input
Capture” (DS60001122) of the “PIC32
Family Reference Manual”, which is
available from the Microchip web site
(
www.microchip.com/PIC32
).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
and bit information.
Note: An ‘x’ in a signal, register or bit name denotes the number of the capture channel.
FIFO CONTROL
ICxBUF
TMR2 TMR3
CaptureEvent
/N
FIFO
ICI<1:0>
ICM<2:0>
ICM<2:0>
101
100
011
010
001
001
111
111
To CPU
Set Flag ICxIF
(In IFSx Register)
Rising Edge Mode
Prescaler Mode
(4th Rising Edge)
Falling Edge Mode
Edge Detection
Prescaler Mode
(16th Rising Edge)
Sleep/Idle
Wake-up Mode
C32 | ICTMR
ICx pin
Mode
110
Specified/Every
Edge Mode
FEDGE