LPC2917 datasheet(30/68 Pages) PHILIPS

30 / 68 page

LPC2917_19_1

Preliminary data sheet

Rev. 1.01 — 15 November 2007

30 of 68

NXP Semiconductors

LPC2917/19

ARM9 microcontroller with CAN and LIN

8.5 CAN gateway

8.5.1 Overview

Controller Area Network (CAN) is the definition of a high-performance communication

protocol for serial data communication. The two CAN controllers in the LPC2917/19

provide a full implementation of the CAN protocol according to the CAN specification

version 2.0B. The gateway concept is fully scalable with the number of CAN controllers,

and always operates together with a separate powerful and flexible hardware acceptance

filter.

The key features are:

• Supports 11-bit as well as 29-bit identifiers

• Double receive buffer and triple transmit buffer

• Programmable error-warning limit and error counters with read/write access

• Arbitration-lost capture and error-code capture with detailed bit position

• Single-shot transmission (i.e. no re-transmission)

• Listen-only mode (no acknowledge; no active error flags)

• Reception of ‘own’ messages (self-reception request)

• Full CAN mode for message reception

8.5.2 Global acceptance filter

The global acceptance filter provides look-up of received identifiers - called acceptance

filtering in CAN terminology - for all the CAN controllers. It includes a CAN ID look-up table

memory, in which software maintains one to five sections of identifiers. The CAN ID

look-up table memory is 2 kB large (512 words, each of 32 bits). It can contain up to 1024

standard frame identifiers (SFF) or 512 extended frame identifiers (EFF) or a mixture of

both types. It is also possible to define identifier groups for standard and extended

message formats.

8.5.3 CAN pin description

The two CAN controllers in the LPC2917/19 have the pins listed below. The CAN pins are

combined with other functions on the port pins of the LPC2917/19. Table 18 shows the

CAN pins (x runs from 0 to 1).

8.6 LIN

8.6.1 Overview

The LPC2917/19 contain two LIN 2.0 master controllers. These can be used as dedicated

LIN 2.0 master controllers with additional support for sync break generation and with

hardware implementation of the LIN protocol according to spec 2.0.

The key features are:

Table 18.

CAN pins

Symbol

Direction

Description

CANx TXDC

out

CAN channel x transmit data output

CANx RXDC

CAN channel x receive data input

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