Oki MSM9225B User manual

MSM9225B
User’s Manual
CAN (Controller Area Network) Controller
Oki Electric Industry Co., Ltd.
Ver. 4.0
July 2001
FEUL9225B-04 1

NOTICE
1. The information contained herein can change without notice owing to product and/or technical improvements. Before using the
product, please make sure that the information being referred to is up-to-date.
2. The outline of action and examples for application circuits described herein have been chosen as an explanation for the
standard action and performance of the product. When planning to use the product, please ensure that the external conditions
are reflected in the actual circuit, assembly, and program designs.
3. When designing your product, please use our product below the specified maximum ratings and within the specified operating
ranges including, but not limited to, operating voltage, power dissipation, and operating temperature.
4. Oki assumes no responsibility or liability whatsoever for any failure or unusual or unexpected operation resulting from
misuse, neglect, improper installation, repair, alteration or accident, improper handling, or unusual physical or
electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or
operation outside the specified operating range.
5. Neither indemnity against nor license of a third party’s industrial and intellectual property right, etc. is granted by us in
connection with the use of the product and/or the information and drawings contained herein. No responsibility is assumed by
us for any infringement of a third party’s right which may result from the use thereof.
6. The products listed in this document are intended for use in general electronics equipment for commercial applications (e.g.,
office automation, communication equipment, measurement equipment, consumer electronics, etc.). These products are not
authorized for use in any system or application that requires special or enhanced quality and reliability characteristics nor in
any system or application where the failure of such system or application may result in the loss or damage of property, or death
or injury to humans.
Such applications include, but are not limited to, traffic and automotive equipment, safety devices, aerospace equipment,
nuclear power control, medical equipment, and life-support systems.
7. Certain products in this document may need government approval before they can be exported to particular countries. The
purchaser assumes the responsibility of determining the legality of export of these products and will take appropriate and
necessary steps at their own expense for these.
8. No part of the contents contained herein may be reprinted or reproduced without our prior permission.
Copyright 2001 Oki Electric Industry Co., Ltd.

Preface
This manual describes the hardware and operation of the MSM9225B CAN Controller
which conforms to the CAN protocol specification (Bosch, V2.0 part B/Active).
In this manual, additions and modifications that have been made on the upgrade to the
MSM9225B from the MSM9225 are indicated by “ ” on their respective pages.
This document is subject to change without notice.
B

Notation
Classification Notation Description
♦Numeric value xxhex, xxh, xxH Indicates a hexadecimal number. x: Any value in the range of 0 to F
xxb Indicates a binary number; “b” may be omitted. x: A value 0 or 1
♦Unit word, W 1 word = 16 bits
byte, B 1 byte = 2 nibbles = 8 bits
nibble, N 1 nibble = 4 bits
maga-, M 106
kilo-, K 210 = 1024
kilo-, k 103= 1000
milli-, m 10-3
micro-, µ 10-6
nano-, n 10-9
second, s (lower case) second
♦Symbol x0hex x indicates any value in the range of 0 to F of the high-order 4 bits.
♦Terminology “H” level, “1” level Indicates high voltage signal levels VIH and VOH as specified by the
electrical characteristics.
“L” level, “0” level Indicates low voltage signal levels VIL and VOL as specified by the
electrical characteristics.
♦Register description
Read/write attribute: R indicates a readable bit and W indicates a writable bit.
MSB/LSB: Most significant bit of the 8-bit register (memory)/least significant bit of the 8-bit register
(memory).
♦Additions and modifications that have been made in the MSM9225B
Indicated by “ ”.
Bit name
Function/meaning
of corresponding
bit value
MSB MMA OW TRQ RCS EIR EIT ERM ARES LSB MCR (x0hex), R/W: R/W
Initial
value: 00000000
0Data frame automatic
transmission disabled for
remote frame reception
1Data frame automatic
transmission enabled for
remote frame reception
Read/write
attribute
A
ddress
Re
g
ister name
Value of the bit
Initial value after
a reset
B

MSM9225B User’s Manual
Contents
Contents – 1
Table of Contents
Chapter 1 Overview
1.1 Overview.....................................................................................................................................................1-1
1.2 Features.......................................................................................................................................................1-1
1.3 Block Diagram............................................................................................................................................1-2
1.4 Configuration Example...............................................................................................................................1-2
1.5 Pin Configuration........................................................................................................................................1-3
1.6 Pin Descriptions..........................................................................................................................................1-4
Chapter 2 Register Descriptions
2.1 Memory Space............................................................................................................................................ 2-1
2.2 Message Memory........................................................................................................................................ 2-3
2.3 Message Memory Related Register ............................................................................................................2-4
2.3.1 Message Control Register (MCR: x0hex).............................................................................................2-4
2.3.2 Identifier 0 (IDR0: x1hex).....................................................................................................................2-7
2.3.3 Identifier 1 (IDR1: x2hex).....................................................................................................................2-8
2.3.4 Identifiers 2, 3, 4/Messages 0-7 (MSG0-7 in the case of standard format;
IDR2-4, TMSG0-7 in the case of extended format: x3 to xDhex)........................................................ 2-8
2.4 Control Registers ......................................................................................................................................2-16
2.4.1 CAN Control Register (CANC: 0Ehex)..............................................................................................2-17
2.4.2 CAN Interrupt Control Register (CANI: 0Fhex).................................................................................2-19
2.4.3 Message Box Count Setting Register (NMES: 1Ehex)....................................................................... 2-21
2.4.4 CAN Bus Timing Register 0 (BTR0: 1Fhex)......................................................................................2-21
2.4.5 CAN Bus Timing Register 1 (BTR1: 2Ehex) .....................................................................................2-23
2.4.6 Communication Input/Output Control Register (TIOC: 2Fhex).........................................................2-27
2.4.7 Group Message Register (GMR0: 3Ehex, GMR1: 3Fhex) .................................................................2-30
2.4.8 Group Message Mask Register (GMSK) ............................................................................................ 2-31
2.4.9 Standby Control Register (STBY: 8Ehex)..........................................................................................2-33
2.4.10 CAN Control Register 2 (CANC2: 8Fhex)......................................................................................... 2-34
2.4.11 Communication Message Box Number Register (TMN: 9Ehex)........................................................2-35
2.4.12 CAN Status Register (CANS: 9Fhex)................................................................................................. 2-36
2.4.13 Transmit Error Counter (TEC: AEhex)............................................................................................... 2-37
2.4.14 Receive Error Counter (REC: AFhex) ................................................................................................2-37
2.4.15 CAN Status Register 2 (CANS2: BEhex)...........................................................................................2-38
2.4.16 Bus Off Release Counter (BOCO: BFhex) .........................................................................................2-39
Chapter 3 Operational Description
3.1 Operational Procedure ................................................................................................................................3-1
3.1.1 Initial Setting......................................................................................................................................... 3-1
3.1.2 Transmit Procedure...............................................................................................................................3-2
3.1.3 Receive Procedure.................................................................................................................................3-3
3.1.4 Message Box Rewrites during Operation.............................................................................................. 3-4
3.1.5 Remote Frame Operation......................................................................................................................3-5
3.1.5.1 Automatic Response........................................................................................................................3-5
3.1.5.2 Manual Response.............................................................................................................................3-7
B
B
B

MSM9225B User’s Manual
Contents
Contents – 2
Chapter 4 Microcontroller Interface
4.1 Serial Interface............................................................................................................................................4-1
4.2 Parallel Interface.........................................................................................................................................4-3
4.3 MSM9225B Connection Examples ............................................................................................................4-4
4.3.1 Microcontroller Interface ......................................................................................................................4-4
4.3.1.1 Address/Data Separate Bus (No Address Latch Signal)..................................................................4-4
4.3.1.2 Address/Data Separate Bus (With Address Latch Signal)...............................................................4-5
4.3.1.3 Address/Data Multiplexed Bus........................................................................................................ 4-5
4.3.1.4 Serial Interface.................................................................................................................................4-6
4.3.2 CAN Bus Interface................................................................................................................................4-7
4.3.2.1 Electrically Isolated from Bus Transceiver (PCA82C250)..............................................................4-7
4.3.2.2 Directly Connected to Bus Transceiver (PCA82C250)................................................................... 4-7
4.3.2.3 Monitoring the CAN Bus.................................................................................................................4-8
Chapter 5 Electrical Characteristics
5.1 Electrical Characteristics ............................................................................................................................5-1
5.1.1 Absolute Maximum Ratings..................................................................................................................5-1
5.1.2 Recommended Operating Conditions ...................................................................................................5-1
5.1.3 DC Characteristics ................................................................................................................................ 5-2
5.1.4 Rx0, Rx1 Characteristics.......................................................................................................................5-2
5.1.5 Tx0, Tx1 Characteristics....................................................................................................................... 5-2
5.1.6 AC Characteristics ................................................................................................................................ 5-3
5.2 Timing Diagrams........................................................................................................................................5-5
5.2.1 Separate Bus Mode ...............................................................................................................................5-5
5.2.2 Separate Bus/Address Latch Mode .......................................................................................................5-6
5.2.3 Multiplexed Bus Mode..........................................................................................................................5-7
5.2.4 Serial Mode........................................................................................................................................... 5-8
5.2.5 Other Timing.........................................................................................................................................5-9
Apppendixes
Appendix A Package Dimensions ...................................................................................................................... A-1
Appendix B MSM9225B Memory Map............................................................................................................. A-2
Appendix C MSM9225B User’s Manual Contents of Revision From 2nd Version to 3rd Version................. A-10

Chapter 1
Overview

MSM9225B User’s Manual
Chapter 1 Overview
1 – 1
Chapter 1 Overview
1.1 Overview
The MSM9225B is a microcontroller peripheral LSI which conforms to the CAN protocol for high-speed LANs
in automobiles.
1.2 Features
•Conforms to CAN protocol specification (Bosch, V2.0 part B/Active)
•Maximum of 1 Mbps bit rate
•Communication method:
Transmission line is bi-directional, two-wire serial communication
NRZ (Non-Return to Zero) system using bit stuff function
Multi-master system
Broadcast system
•Up to 16 message boxes can be used, and messages up to 8 bytes long can be transmitted or received for each
message box.
Number of received messages can be extended by group message function (up to 2 groups can be set)
Overwrite flag is provided
•Priority control by identifier
2032 types in standard format, 2032 ×218 types in extended format
•Microcontroller interface
Corresponding to both parallel and serial interface
Parallel interface: Separate address/data bus type (with address latch signal/no address latch signal) and
multiplexed address/data bus type
Serial interface: Synchronous communication type
Three interrupt sources: transmission/receive/error
•Error control:
Bit error/stuff error/CRC error/form error/acknowledgment error detection functions
Retransmission/error status monitoring function when error occurs
Bit error flag/stuff error flag/CRC error flag/form error flag/acknowledge error flag are provided
•Communication control by remote data request function
•Sleep/Stop mode function
•Supply voltage: 5 V±10%
•Operating temperature: –40 to +125°C
•Package: 44-pin plastic QFP (QFP44-P-910-0.80-2K) (Product name: MSM9225BGA-2K)
B
B

MSM9225B User’s Manual
Chapter 1 Overview
1 – 2
1.3 Block Diagram
Figure 1-1 Block Diagram
1.4 Configuration Example
CAN
ABS
Engine
controller
CAN
CAN
Transmission Automatic
air conditioner
CAN
Seat-position controller
CAN
CAN
Outside mirror controller
CAN
Power window
Suspension
CAN
CAN Bus
Power steering
CAN
Figure 1-2 Configuration Example
B
Rx0
Tx0
Tx1
Rx1
VDD
GND
Bit stream
logic
(BSL)
Transmission
control logic
(TCL)
Error
management
logic (EML)
Bit timing logic (BTL)
Message
memory
Control
register
Data
manage-
ment
logic
Receive
control logic
(RCL)
XT
X
T
RESET
Timing
generator
microcontroller Interface
8
Serial I/F Parallel I/F
A7-0 8
AD7-0/D7-0
PALE
P
WR
P
RDW/SRW
P
RDY/SWAIT RW
WAIT
SCLK
SDI
SDO
R
D
R
DY
Mode1, 0
C
S
I
NT

MSM9225B User’s Manual
Chapter 1 Overview
1 – 3
1.5 Pin Configuration
Connect all VDD pins. Connect all GND pins.
Figure 1-3 44-Pin Plastic QFP (Top View)
B
B
33 32 31 30 29 28 27 26 25 24 23
1 2 3 4 5 6 7 8 9
10
11
A4 A5
A6
A7
SDO
GND
SDI
SCLK
PRD W
/SR
CS
INT
AD2/D2 AD1/D1 AD0/D0 Mode1 Mode0 GND PALE PWR RESET V
DD
T1
X
34
35
36
37
38
39
40
41
42
43
44
A3
A2
A1
A0
V
DD
GND
AD7/D7
AD6/D6
AD5/D5
AD4/D4
AD3/D3
12
13
14
22
21
20
19
18
17
16
15
V
DD
XT
XT
GND
PRDY
/SWAIT
GND
R0
X
R1
X
V
DD
GND
T0
X