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changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata

December 1995

COPYRIGHT

INTEL CORPORATION 1995

Order Number 272250-006

82527

SERIAL COMMUNICATIONS CONTROLLER

CONTROLLER AREA NETWORK PROTOCOL

Automotive

Y

Supports CAN Specification 20

Standard Data and Remote Frames

Extended Data and Remote Frames

Y

Programmable Global Mask

Standard Message ldentifier

Extended Message ldentifier

Y

15 Message Objects of 8-Byte Data

Length

14 TxRx Buffers

1 Rx Buffer with Programmable Mask

Y

Flexible CPU Interface

8-Bit Multiplexed

16-Bit Multiplexed

8-Bit Non-Multiplexed

(SynchronousAsynchronous)

Serial Interface

Y

Programmable Bit Rate

Y

Programmable Clock Output

Y

Flexible Interrupt Structure

Y

Flexible Status Interface

Y

Configurable Output Driver

Y

Configurable Input Comparator

Y

Two 8-Bit Bidirectional IO Ports

Y

44-Lead PLCC Package

Y

44-Lead QFP Package

Y

Pinout Compatibility with the 82526

The 82527 serial communications controller is a highly integrated device that performs serial communication

according to the CAN protocol It performs all serial communication functions such as transmission and

reception of messages message filtering transmit search and interrupt search with minimal interaction from

the host microcontroller or CPU

The 82527 is Intel’s first device to support the standard and extended message frames in CAN Specification

20 Part B It has the capability to transmit receive and perform message filtering on extended message

frames Due to the backwardly compatible nature of CAN Specification 20 the 82527 also fully supports the

standard message frames in CAN Specification 20 Part A

The 82527 features a powerful CPU interface that offers flexibility to directly interface to many different CPUs

It can be configured to interface with CPUs using an 8-bit multiplexed 16-bit multiplexed or 8-bit non-multi-

plexed addressdata bus for Intel and non-Intel architectures A flexible serial interface (SPI) is also available

when a parallel CPU interface is not required

The 82527 provides storage for 15 message objects of 8-byte data length Each message object can be

configured as either transmit or receive except for the last message object The last message object is a

receive-only buffer with a special mask design to allow select groups of different message identifiers to be

received

The 82527 also implements a global masking feature for message filtering This feature allows the user to

globally mask any identifier bits of the incoming message The programmable global mask can be used for

both standard and extended messages

The 82527 PLCC offers hardware or pinout compatibility with the 82526 It is pin-to-pin compatible with the

82526 except for pins 9 30 and 44 These pins are used as chip selects on the 82526 and are used as CPU

interface mode selection pins on the 82527

The 82527 is fabricated using Intel’s reliable CHMOS III 5V technology and is available in either 44-lead PLCC

or 44-lead QFP for the automotive temperature range (b40 Cto a125 C)