DSPIC33FJ32MC304-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

DSPIC33FJ32MC304-I/SP

16-bit Digital Signal Controllers (up to 128 KB Flash and 16K SRAM) with Motor Control PWM and Advanced Analog

Microchip Technology 

dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04

21.2 Frame Types

The ECAN module transmits various types of frames

which include data messages, or remote transmission

requests initiated by the user, as other frames that are

automatically generated for control purposes. The

following frame types are supported:

• Standard Data Frame:

A standard data frame is generated by a node when

the node wishes to transmit data. It includes an 11-bit

Standard Identifier (SID), but not an 18-bit Extended

Identifier (EID).

• Extended Data Frame:

• An extended data frame is similar to a standard

data frame, but includes an extended identifier as

well.

• Remote Frame:

• It is possible for a destination node to request the

data from the source. For this purpose, the

destination node sends a remote frame with an

identifier that matches the identifier of the

required data frame. The appropriate data source

node sends a data frame as a response to this

remote request.

• Error Frame:

• An error frame is generated by any node that

detects a bus error. An error frame consists of two

fields: an error flag field and an error delimiter

field.

• Overload Frame:

• An overload frame can be generated by a node as

a result of two conditions. First, the node detects a

dominant bit during interframe space which is an

illegal condition. Second, due to internal condi-

tions, the node is not yet able to start reception of

the next message. A node can generate a maxi-

mum of 2 sequential overload frames to delay the

start of the next message.

• Interframe Space:

• Interframe space separates a proceeding frame

(of whatever type) from a following data or remote

frame.

DS70291G-page 254

© 2007-2012 Microchip Technology Inc.

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