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PDF UPD72042BGT Data sheet ( Hoja de datos )
| Número de pieza | UPD72042BGT | |
| Descripción | LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL | |
| Fabricantes | NEC | |
| Logotipo |  |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD72042A, 72042B
LSI DEVICES FOR Inter Equipment BusTM (IEBusTM)
PROTOCOL CONTROL
The µPD72042A and µPD72042B are microcomputer peripheral LSI devices for IEBus protocol control.
The µPD72042A and µPD72042B perform all the processing required for layers 1 and 2 of the IEBus. The devices
incorporate large transmission and reception buffers, allowing the microcomputer to perform IEBus operations without
interruption. They also contain an IEBus driver and receiver, allowing them to directly connected to the bus directly.
FEATURES
• Control of layers 1 and 2 of the IEBus protocol
• Support of a multi-master scheme
• Broadcast function
• Two communication modes having different
transmission speeds can be selected.
Mode 0
Mode 1
When operating
at 6 MHz
Approx. 3.9 Kbps
Approx. 17 Kbps
When operating
at 6.29 MHz
Approx. 4.1 Kbps
Approx. 18 Kbps
q Built-in IEBus driver and receiver
q Transmission and reception buffers
Transmission buffer : 33 bytes, FIFO
Reception buffer
: 40 bytes, FIFO (capable of
holding more than one frame
of reception data.)
ORDERING INFORMATION
• Microcomputer interface
Three-/two-wire serial I/O
• Transfer starting with MSB : µPD72042A
• Transfer starting with LSB : µPD72042B
• Program crashes can be detected by means of a
watchdog timer.
• Low power consumption (standby mode):
50 µA (max)
• Oscillator frequency (fX): 6 MHz, 6.29 MHz
• frequency accuracy: ±1.5%
• Operating voltage: 5 V ±10%
Part number
µPD72042AGT
µPD72042BGT
Package
16-pin plastic SOP (375 mil)
16-pin plastic SOP (375 mil)
Starting with MSB/LSB
MSB
LSB
The information in this document is subject to change without notice.
Document No. S13990EJ2V0DS00 (2nd edition)
(Previous No. ID-3649)
Date Published January 1999 N CP(N)
Printed in Japan
The mark shows major revised points.
©
1995
1 page  
µPD72042A, 72042B
9. RECOMMENDED SOLDERING CONDITIONS ............................................................................. 89
APPENDIX A MAIN DIFFERENCES BETWEEN µPD72042A, µPD72042B, AND µPD6708 ......... 90
APPENDIX B IEBus PROTOCOL ANALYZER .................................................................................. 90
DATA SHEET S13990EJ2V0DS00
5
5 Page 
µPD72042A, 72042B
2.2.3 Communication Address
With the IEBus, each device is assigned a unique 12-bit communication address. The communication address
consists of the following parts:
High-order 4 bits : Group number (number identifying the group to which a device belongs)
Low-order 8 bits : Unit number (number identifying a device in a group)
2.2.4 Broadcast
In ordinary communication, transmission and reception are performed between one master unit and one associated
slave unit. Broadcast can also be done between one master unit and more than one slave unit. In this case master
unit transmits data to an arbitrary number of slave units. In this case, the slave units do not return on acknowledge
signal to the master unit.
Whether the communication to be performed is broadcast or ordinary communication is determined by the setting
of the broadcast bit. (For details of the broadcast bit, see (1) 2 in Section 2.3.)
There are two types of broadcast.
(1) Group broadcast
Broadcast is performed to the devices in a particular group. These devices all have the same group number,
as indicated by the high-order 4 bits of each communication address.
(2) General broadcast
Broadcast is performed to all devices, regardless of their group numbers.
These two types of broadcast are distinguished by the slave address. (For details of the slave address, see (3)
in Section 2.3.)
2.3 TRANSMISSION PROTOCOL
Fig. 2-1 shows the IEBus transmission signal format.
Communication data is transmitted as a sequence of signals called a communication frame. The transmission
speed and the maximum amount of data that can be transmitted in one communication frame depend on the
communication mode.
DATA SHEET S13990EJ2V0DS00
11
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