Datasheet

© 2011 Microchip Technology Inc. DS70118J-page 67
dsPIC30F2010
11.0 INPUT CAPTURE MODULE
This section describes the Input Capture module and
associated operational modes. The features provided
by this module are useful in applications requiring Fre-
quency (Period) and Pulse measurement. Figure 11-1
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). The dsPIC DSC devices contain up to
eight capture channels, (i.e., the maximum value of
N is 8).
FIGURE 11-1: INPUT CAPTURE MODE BLOCK DIAGRAM
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
general device functionality, refer to the
“dsPIC30F Family Reference Manual”
(DS70046).
Note: The dsPIC30F2010 device has four
capture inputs – IC1, IC2, IC7 and IC8.
The naming of these four capture chan-
nels is intentional and preserves software
compatibility with other dsPIC DSC
devices.
ICxBUF
Prescaler
ICx
ICM<2:0>
Mode Select
3
Note: Where ‘x’ is shown, reference is made to the registers or bits associated to the respective input capture channels 1 through N.
10
Set Flag
Pin
ICxIF
ICTMR
T2_CNT
T3_CNT
Edge
Detection
Logic
Clock
Synchronizer
1, 4, 16
From General Purpose Timer Module
16 16
FIFO
R/W
Logic
ICI<1:0>
ICBNE, ICOV
ICxCON
Interrupt
Logic
Set Flag
ICxIF
Data Bus