PIC24FJ64GA datasheet(183/262 Pages) MICROCHIP

183 / 262 page

Preliminary

DS39881C-page 181

PIC24FJ64GA004 FAMILY

19.3

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

1 = Discontinue module operation when device enters Idle mode

0 = 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

1 = FIFO is full

0 = FIFO is not full

bit 6

CRCMPT: FIFO Empty Bit

1 = FIFO is empty

0 = FIFO is not empty

bit 5

Unimplemented: Read as ‘0’

bit 4

CRCGO: Start CRC bit

1 = Start CRC serial shifter

0 = 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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