DSPIC30F MICROCHIP [Microchip Technology], DSPIC30F Datasheet - Page 97

• Manufacturer Part Number: DSPIC30F
• Description: General Purpose and Sensor Families High-Performance Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

12.0
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 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
FIGURE 12-1:
 2004 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
INPUT CAPTURE MODE BLOCK DIAGRAM
3
ICxCON
Data Bus
Mode Select
ICM<2:0>
ICBNE, ICOV
Synchronizer
Clock
ICI<1:0>
Preliminary
Detection
Edge
Logic
From GP 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 devices contain up to 8
capture channels (i.e., the maximum value of N is 8).
Interrupt
Logic
Set Flag
Set Flag
ICxIF
ICxIF
Logic
FIFO
R/W
T2_CNT
dsPIC30F
ICxBUF
1
16
DS70083G-page 95
0
T3_CNT
16
ICTMR