MCP2518FD datasheet(51/96 Pages) MICROCHIP

51 / 96 page

 2019 Microchip Technology Inc.

DS20006027A-page 51

MCP2518FD

CiTXQSTA – TRANSMIT QUEUE STATUS REGISTER

U-0

—

bit 31

bit 24

U-0

—

bit 23

bit 16

U-0

R-0

—

—TXQCI<4:0>( 1)

bit 15

bit 8

HS/C-0

U-0

R-1

U-0

R-1

TXABT( 2)( 3)

TXLARB

( 2)( 3)

TXERR( 2)( 3)

TXATIF

—

TXQEIF

—TXQNIF

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 3-13

Unimplemented: Read as ‘0’

bit 12-8

TXQCI<4:0>: Transmit Queue Message Index bits( 1)

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

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 loose 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

1 = Interrupt pending

0 = Interrupt Not pending

bit 3

Unimplemented: Read as ‘0’

bit 2

TXQEIF: Transmit Queue Empty Interrupt Flag bit

1 = TXQ is empty

0 = TXQ is not empty, at least 1 message queued to be transmitted

bit 1

Unimplemented: Read as ‘0’

bit 0

TXQNIF: Transmit Queue Not Full Interrupt Flag bit

1 = TXQ is not full

0 = TXQ is full

Note 1:

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

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

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 TXQ is reset.

MCP2518FD 数据表(PDF) 51 Page - Microchip Technology

MCP2518FD 数据表(HTML) 51 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

链接网址

MCP2518FD 数据表(PDF) 51 Page - Microchip Technology

MCP2518FD 数据表(HTML) 51 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

链接网址

数据表下载