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April 1
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DATA SHEET
MOS INTEGRATED CIRCUIT
µ
PD6708
IEBus™ (Inter Equipment Bus™) PROTOCOL CONTROL LSI
DESCRIPTION
The
µ
PD6708 is a peripheral LSI for microcontrollers that controls the protocol of the IEBus.
This LSI processes the protocol of the IEBus. Because it is provided with a transmit/receive buffer, the microcontroller
can concentrate on the application processing of the IEBus. Because the
µ
PD6708 also contains an IEBus driver/receiver,
it can be directly connected to the bus.
FEATURES
•
Protocol control of IEBus
• Multi-master system
• Broadcast communication function (commu-
nication between one unit and multiple units)
• Choice of three modes with different trans-
mission speeds
At 12 MHz
Mode 0
Mode 1
Mode 2
Approx. 3.9 Kbps
Approx. 17 Kbps
Approx. 26 Kbps
At 12.58 MHz
Approx. 4.1 Kbps
Approx. 18 Kbps
Approx. 27 Kbps
•
On-chip IEBus driver/receiver
•
Transmit/receive buffer
Transmit: 4-byte FIFO
Receive: 20-byte FIFO
•
Interface with microcontroller
• Three-line serial I/O (SCK, SO, SI pins)
• Transfer with MSB first
•
Oscillation frequency (f
X
): 12 MHz, 12.58 MHz
• In modes 0 and 1:
±1.5
%
• In mode 2:
±0.5
%
•
Supply voltage: V
DD
= 5 V
±10
%
ORDERING INFORMATION
Part Number
Package
16-pin plastic DIP (300 mil)
16-pin plastic SOP (300 mil)
µ
PD6708CX
µ
PD6708GS
APPLICATION FIELD
Fields where a small-scale digital data transfer system is required between equipment, such as automobile electronic
systems and industrial equipment
The information in this document is subject to change without notice.
The mark
5
shows major revised points.
Document No. U10680EJ2V0DS00 (2nd edition)
(Previous No. IC-3282)
Date Published January 1996 P
Printed in Japan
©
1993
µ
PD6708
PIN CONFIGURATION (TOP VIEW)
• 16 pin plastic DIP (300 mil)
µ
PD6708CX
• 16 pin plastic SOP (300 mil)
µ
PD6708GS
SCK
1
16
V
DD
SI
2
15
TEST
SO
3
14
RESET
IRQ
4
13
CS
R/W
5
12
C/D
XI
6
11
AV
DD
XO
7
10
BUS+
GND
8
9
BUS–
SCK
SI
SO
IRQ
R/W
XI, XO
GND
BUS–, BUS+
AV
DD
C/D
CS
RESET
TEST
V
DD
: Serial clock input
: Serial data input
: Serial data output
: Interrupt request output
: Read/write switchover input
: System clock
: Ground
: IEBus input/output
: IEBus analog power supply (connected to V
DD
pin)
: Command/data switchover input
: Chip select input
: Reset input
: Test input (connected to V
DD
pin)
: Positive power supply
2
µ
PD6708
CONTENTS
1.
2.
PIN FUNCTIONS ......................................................................................................................................... 5
1.1
List of Pin Functions ......................................................................................................................................... 5
IEBus OPERATION .................................................................................................................................... 6
2.1
2.2
Operation Overview ........................................................................................................................................... 6
IEBus Communication Protocol ...................................................................................................................... 7
2.2.1
Bus mastership determination (arbitration) ................................................................................... 8
2.2.2
Communication modes ...................................................................................................................... 8
2.2.3
Communication address ................................................................................................................... 9
2.2.4
Broadcast communication ................................................................................................................ 9
Transfer Protocol ............................................................................................................................................. 10
Transfer Data (Contents of Data Field) ......................................................................................................... 16
Bit Format ......................................................................................................................................................... 19
2.3
2.4
2.5
3.
INTERNAL CONFIGURATION ................................................................................................................. 20
3.1
3.2
3.3
3.4
Data Link Layer Controller ............................................................................................................................. 21
Physical Layer Controller ............................................................................................................................... 21
IEBus Driver/Receiver ..................................................................................................................................... 21
Host Interface ................................................................................................................................................... 21
4.
INTERFACING WITH HOST CONTROLLER .......................................................................................... 22
4.1
Accessible Buffers and Registers from Host Controller ........................................................................... 22
4.1.1
Write data buffer (WDB) .................................................................................................................. 22
4.1.2
Read data buffer (RDB) ................................................................................................................... 22
4.1.3
Command register (CMR) ................................................................................................................ 22
4.1.4
Status register (STR) ....................................................................................................................... 23
Host Interface Modes ...................................................................................................................................... 23
4.2.1
Switching through pin control ....................................................................................................... 24
4.2.2
Switching through software control .............................................................................................. 26
Reset Mode ....................................................................................................................................................... 28
4.2
4.3
5.
COMMUNICATION CONTROL COMMANDS ......................................................................................... 30
5.1
5.2
Overview of Communication Control Commands....................................................................................... 30
Communication Control Command Functions ............................................................................................ 31
5.2.1
INIT command (command code: 0000).......................................................................................... 31
5.2.2
SETSA command (command code: 0001) .................................................................................... 32
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
MREQ1 command (command code: 0010) ................................................................................... 33
MREQ2 command (command code: 0011) ................................................................................... 34
ABORT command (command code: 0100) ................................................................................... 34
SETSD command (command code: 0101) .................................................................................... 35
GETSTA command (command code: 0110) .................................................................................. 36
SETREV command (command code: 0111) .................................................................................. 37
6.
RETURN CODES ...................................................................................................................................... 38
6.1
6.2
6.3
6.4
6.5
Return
Return
Return
Return
Return
Codes
Codes
Codes
Codes
Codes
in Master/Slave Data Transmission ..................................................................................... 38
in Master Reception ............................................................................................................... 38
in Slave Reception ................................................................................................................. 39
in Broadcast Reception ......................................................................................................... 39
Generation Intervals ............................................................................................................... 40
7.
COMMUNICATING WITH HOST CONTROLLER ................................................................................... 43
7.1
Master Transmission ....................................................................................................................................... 43
7.1.1
Master transmission by MREQ1 command .................................................................................. 43
7.1.2
Master transmission by MREQ2 command .................................................................................. 44
3
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