48GA004 datasheet(189/268 Pages) MICROCHIP

189 / 268 page

 2010 Microchip Technology Inc.

DS39881D-page 189

PIC24FJ64GA004 FAMILY

20.3

Registers

There are four registers used to control programmable

CRC operation:

• CRCCON

• CRCXOR

• CRCDAT

• CRCWDAT

CRCCON: CRC CONTROL REGISTER

U-0

R/W-0

R-0

—

CSIDL

VWORD4

VWORD3

VWORD2

VWORD1

VWORD0

bit 15

bit 8

R-0

R-1

U-0

R/W-0

CRCFUL

CRCMPT

—

CRCGO

PLEN3

PLEN2

PLEN1

PLEN0

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 15-14

Unimplemented:

Read as ‘0’

bit 13

CSIDL:

CRC Stop in Idle Mode bit

= Discontinue module operation when device enters Idle mode

= Continue module operation in Idle mode

bit 12-8

VWORD4:VWORD0:

Pointer Value bits

Indicates the number of valid words in the FIFO. Has a maximum value of 8 when PLEN3:PLEN0 > 7,

or 16 when PLEN3:PLEN0



7.

bit 7

CRCFUL

: FIFO Full bit

= FIFO is full

= FIFO is not full

bit 6

CRCMPT:

FIFO Empty Bit

= FIFO is empty

= FIFO is not empty

bit 5

Unimplemented:

Read as ‘0’

bit 4

CRCGO:

Start CRC bit

= Start CRC serial shifter

= CRC serial shifter turned off

bit 3-0

PLEN3:PLEN0:

Polynomial Length bits

Denotes the length of the polynomial to be generated minus 1.

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