MCP2518FD datasheet(56/96 Pages) MICROCHIP

56 / 96 page

MCP2518FD

DS20006027A-page 56

 2019 Microchip Technology Inc.

CiFIFOSTAm – FIFO STATUS REGISTER m, (m = 1 TO 31)

U-0

—

bit 31

bit 24

U-0

—

bit 23

bit 16

U-0

R-0

—

FIFOCI<4:0>( 1)

bit 15

bit 8

HS/C-0

R-0

TXABT( 2)( 3)

TXLARB

( 2)( 3)

TXERR( 2)( 3)

TXATIF

RXOVIF

TFERFFIF

TFHRFHIF

TFNRFNIF

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 31-13

Unimplemented: Read as ‘0’

bit 12-8

FIFOCI<4:0>: FIFO Message Index bits( 1)

TXEN = 1 (FIFO is configured as a Transmit FIFO)

A read of this bit field will return an index to the message that the FIFO will next attempt to transmit.

TXEN = 0 (FIFO is configured as a Receive FIFO)

A read of this bit field will return an index to the message that the FIFO will use to save the next

message

bit 7

TXABT: Message Aborted Status bit( 2)( 3)

1 = Message was aborted

0 = Message completed successfully

bit 6

TXLARB: Message Lost Arbitration Status bit( 2)( 3)

1 = Message lost arbitration while being sent

0 = Message did not lose arbitration while being sent

bit 5

TXERR: Error Detected During Transmission bit( 2)( 3)

1 = A bus error occurred while the message was being sent

0 = A bus error did not occur while the message was being sent

bit 4

TXATIF: Transmit Attempts Exhausted Interrupt Pending bit

TXEN = 1 (FIFO is configured as a Transmit FIFO)

1 = Interrupt pending

0 = Interrupt not pending

TXEN = 0 (FIFO is configured as a Receive FIFO)

Read as ‘0’

Note 1:

FIFOCI<4:0> gives a zero-indexed value to the message in the FIFO. If the FIFO is 4 messages deep

(FSIZE = 5’h03) FIFOCI will take on a value of 0 to 3 depending on the state of the FIFO.

This bit is cleared when TXREQ is set or by writing a 0 using the SPI.

This bit is updated when a message completes (or aborts) or when the FIFO is reset.

MCP2518FD 数据表(PDF) 56 Page - Microchip Technology

MCP2518FD 数据表(HTML) 56 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

数据表下载