PIC18LF4331 datasheet(155/392 Pages) MICROCHIP

155 / 392 page

 2010 Microchip Technology Inc.

DS39616D-page 155

PIC18F2331/2431/4331/4431

The three input capture channels are controlled

through

the

Input

Capture

Control

registers,

CAP1CON, CAP2CON and CAP3CON. Each channel

is configured independently with its dedicated register.

The implementation of the registers is identical except

for the Special Event Trigger (see Section 17.1.8

“Special Event Trigger (CAP1 Only)”

). The typical

Capture Control register is shown in Register 17-1.

Note:

Throughout this section, references to

registers and bit names that may be asso-

ciated with a specific capture channel will

be referred to generically by the use of the

term ‘x’ in place of the channel number.

For example, ‘CAPxREN’ may refer to the

Capture Reset Enable bit in CAP1CON,

CAP2CON or CAP3CON.

CAPxCON: INPUT CAPTURE x CONTROL REGISTER

U-0

R/W-0

U-0

R/W-0

—

CAPxREN

—

CAPxM3

CAPxM2

CAPxM1

CAPxM0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

Unimplemented:

Read as ‘0’

bit 6

CAPxREN:

Time Base Reset Enable bit

= Enabled

= Disable selected time base Reset on capture

bit 5-4

Unimplemented:

Read as ‘0’

bit 3-0

CAPxM<3:0>:

Input Capture x (ICx) Mode Select bits

1111

= Special Event Trigger mode; the trigger occurs on every rising edge on CAP1 input(1)

1110

= Special Event Trigger mode; the trigger occurs on every falling edge on CAP1 input(1)

1101

= Unused

1100

= Unused

1011

= Unused

1010

= Unused

1001

= Unused

1000

= Capture on every CAPx input state change

0111

= Pulse-Width Measurement mode, every rising to falling edge

0110

= Pulse-Width Measurement mode, every falling to rising edge

0101

= Frequency Measurement mode, every rising edge

0100

= Capture mode, every 16th rising edge

0011

= Capture mode, every 4th rising edge

0010

= Capture mode, every rising edge

0001

= Capture mode, every falling edge

0000

= Input Capture x (ICx) off

Note 1:

Special Event Trigger is only available on CAP1. For CAP2 and CAP3, this configuration is unused.

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