DSPIC30F4012 Microchip Technology Inc., DSPIC30F4012 Datasheet - Page 79

• Manufacturer Part Number: DSPIC30F4012
• Description: Dspic30f4011/4012 Enhanced Flash 16-bit Digital Signal Controller
• Manufacturer: Microchip Technology Inc.

12.0
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
FIGURE 12-1:
© 2007 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). For more information on the device
instruction set and programming, refer to the “dsPIC30F/
33F Programmer’s Reference Manual” (DS70157).
Note:
ICx
Pin
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
Data Bus
ICxCON
Mode Select
ICM<2:0>
ICBNE, ICOV
Synchronizer
Clock
ICI<1:0>
Detection
Edge
Logic
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 dsPIC30F4011/4012 devices have 4 capture
channels.
Interrupt
Note:
Logic
dsPIC30F4011/4012
Set Flag
Set Flag
From Timer Module
ICxIF
ICxIF
The dsPIC30F4011/4012 devices have
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 Digital
Signal Controllers.
Logic
FIFO
R/W
T2_CNT
1
ICxBUF
16
DS70135E-page 77
0
T3_CNT
16
ICTMR