CP3SP33SMSSLASHNOPB datasheet(199/407 Pages) TI1

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CP3SP33

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SNOSCW5 – MAY 2013

The ID field is used to build the 29-bit identifier of an extended frame. The ID[28:18] field is used

for the 11 standard frame identifier bits.

22.10.5 Storage of Remote Messages

During remote frame transfer, the buffer registers DATA0–DATA3 are “don’t cares”. If a remote frame is

transmitted, the contents of these registers are ignored. If a remote frame is received, the contents of

these registers will be overwritten with invalid data. The structure of a message buffer set up for a remote

frame with extended identifier is shown in Table 22-12.

Table 22-12. Extended Remote Frame

Buffer

Address

BASE + 00h

CNSTAT

DLC

Reserved

PRI

BASE + 04h

TSTP

TSTP[15:0]

BASE + 08h

DATA3

Data7[7:0]

Data8[7:0]

BASE + 0Ch

DATA2

Data5[7:0]

Data6[7:0]

BASE + 10h

DATA1

Data3[7:0]

Data4[7:0]

BASE + 14h

DATA0

Data1[7:0]

Data2[7:0]

BASE + 18h

ID0

ID[14:0]

RTR

BASE + 1Ch

ID1

ID[28:18]

SRR

IDE

ID17:15]

SRR The Substitute Remote Request bit replaces the RTR bit used in standard frames at this bit

position. The SRR bit needs to be set by software if the buffer is configured to transmit a message

with an extended identifier. It will be received as monitored on the CAN bus.

IDE

The Identifier Extension bit determines whether the message is a standard frame or an extended

frame.

0 – Message is a standard frame using 11 identifier bits.

1 – Message is an extended frame.

RTR The Remote Transmission Request bit indicates whether the message is a data frame or a remote

frame.

0 – Message is a data frame.

1 – Message is a remote frame.

The ID field is used to build the 29-bit identifier of an extended frame.

22.10.6 CAN Global Configuration Register n (CGCRn)

The CGCRn register is a 16-bit, read/write register used to:

•

Enable/disable the CAN module.

•

Configure the BUFFLOCK function for the message buffer 0..14.

•

Enable/disable the time stamp synchronization.

•

Set the logic levels of the CAN Input/Output pins, CANnRX and CANnTX.

•

Choose the data storage direction (DDIR).

•

Select the error interrupt type (EIT).

•

Enable/disable diagnostic functions.

Reserved

EIT

DIAGEN

INTERNAL

LOOPBACK

IGNACK

DDIR

TSTPE

BUFFLOCK

CRX

CANEN

R/W

Dual CAN Interfaces

199

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