D301 datasheet(274/416 Pages) MICROCHIP

274 / 416 page

PIC24FJ256GA705 FAMILY

DS30010118D-page 274

 2016-2018 Microchip Technology Inc.

CRCCON1: CRC CONTROL 1 REGISTER

R/W-0

U-0

R/W-0

HSC/R-0

CRCEN

—

CSIDL

VWORD4

VWORD3

VWORD2

VWORD1

VWORD0

bit 15

bit 8

HSC/R-0

HSC/R-1

R/W-0

HC/R/W-0

R/W-0

U-0

CRCFUL

CRCMPT

CRCISEL

CRCGO

LENDIAN

—

bit 7

bit 0

Legend:

HC = Hardware Clearable bit

HSC = Hardware Settable/Clearable bit

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

CRCEN: CRC Enable bit

1 = Enables module

0 = Disables module; all state machines, pointers and CRCWDAT/CRCDAT registers reset; other SFRs

are NOT reset

bit 14

Unimplemented: Read as ‘0’

bit 13

CSIDL: CRC Stop in Idle Mode bit

1 = Discontinues module operation when device enters Idle mode

0 = Continues module operation in Idle mode

bit 12-8

VWORD<4:0>: CRC Pointer Value bits

Indicates the number of valid words in the FIFO. Has a maximum value of 8 when PLEN<4:0>

 7 or 16

when PLEN<4:0>

7.

bit 7

CRCFUL: CRC FIFO Full bit

1 = FIFO is full

0 = FIFO is not full

bit 6

CRCMPT: CRC FIFO Empty bit

1 = FIFO is empty

0 = FIFO is not empty

bit 5

CRCISEL: CRC Interrupt Selection bit

1 = Interrupt on FIFO is empty; the final word of data is still shifting through the CRC

0 = Interrupt on shift is complete and results are ready

bit 4

CRCGO: Start CRC bit

1 = Starts CRC serial shifter

0 = CRC serial shifter is turned off

bit 3

LENDIAN: Data Shift Direction Select bit

1 = Data word is shifted into the CRC, starting with the LSb (little endian)

0 = Data word is shifted into the CRC, starting with the MSb (big endian)

bit 2-0

Unimplemented: Read as ‘0’

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