DSPIC30F2023 Microchip Technology Inc., DSPIC30F2023 Datasheet - Page 99

• Manufacturer Part Number: DSPIC30F2023
• Description: 28/44-pin Dspic30f1010/202x Enhanced Flash Smps 16-bit Digital Signal Controller
• Manufacturer: Microchip Technology Inc.

10.0
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 10-1
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
FIGURE 10-1:
© 2006 Microchip Technology Inc.
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).
ICx
Pin
Note:
INPUT CAPTURE MODULE
Where ‘x’ is shown, reference is made to the registers or bits associated to the respective input
capture channels 1 through N.
Prescaler
1, 4, 16
3
INPUT CAPTURE MODE BLOCK DIAGRAM
Data Bus
ICxCON
Mode Select
ICM<2:0>
ICBNE, ICOV
Synchronizer
Clock
ICI<1:0>
Preliminary
Detection
Logic
Edge
From General Purpose Timer Module
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 8
capture channels, (i.e., the maximum value of N is 8).
Interrupt
Logic
Note:
dsPIC30F1010/202X
Set Flag
Set Flag
ICxIF
ICxIF
The dsPIC30F1010 devices does not fea-
ture a Input Capture module. The
dsPIC30F202X devices have one capture
input – IC1. The naming of this capture
channel is intentional and preserves soft-
ware compatibility with other dsPIC DSC
devices.
FIFO
Logic
R/W
T2_CNT
1
ICxBUF
16
DS70178C-page 97
0
T3_CNT
16
ICTMR