DSPIC30F3011-30I Datasheet, PDF (81/226 Pages) Microchip Technology – High-Performance, 16-Bit Digital Signal Controllers

dsPIC30F3010/3011
12.0 INPUT CAPTURE MODULE
Note:
This data sheet summarizes features of
this group of dsPIC30F devices and is not
intended to be a complete reference
source. For more information on the CPU,
peripherals, register descriptions and gen-
eral device functionality, refer to the
“dsPIC30F Family Reference Manual”
(DS70046).
This section describes the input capture module and
associated operational modes. The features provided by
this module are useful in applications requiring
frequency (period) and pulse measurement. Figure 12-1
depicts a block diagram of the input capture module.
Input capture is useful for such modes as:
• Frequency/Period/Pulse Measurements
• Additional Sources of External Interrupts
The key operational features of the input capture
module are:
• Simple Capture Event mode
• Timer2 and Timer3 mode selection
• Interrupt on input capture event
These operating modes are determined by setting
the appropriate bits in the ICxCON register
(where x = 1,2,...,N).
Note:
The dsPIC30F3010/3011 devices have
four capture channels. The channels are
designated IC1, IC2, IC7 and IC8 to
maintain software compatibility with other
dsPIC30F devices.
FIGURE 12-1:
INPUT CAPTURE MODE BLOCK DIAGRAM
From General Purpose Timer Module T2_CNT
T3_CNT
ICx
Pin
Prescaler
1, 4, 16
Clock
Synchronizer
Edge
Detection
Logic
FIFO
R/W
Logic
3
ICM<2:0>
Mode Select
ICBNE, ICOV
ICxCON
ICI<1:0>
Interrupt
Logic
16 16
ICTMR
10
ICxBUF
Note:
Data Bus
Set Flag
ICxIF
Where ‘x’ is shown, reference is made to the registers or bits associated to the respective input capture
channels, 1 through N.
© 2008 Microchip Technology Inc.
DS70141E-page 79