UPD72042B Datasheet, PDF (1/90 Pages) NEC – LSI DEVICE FOR Inter Equipment Bus (IEBus) PROTOCOL CONTROL

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD72042B
LSI DEVICE FOR Inter Equipment Bus^TM (IEBus^TM)
PROTOCOL CONTROL
The µPD72042B is a microcomputer peripheral LSI device for IEBus protocol control.
The µPD72042B performs all the processing required for layers 1 and 2 of the IEBus. The device incorporates
large transmission and reception buffers, allowing the microcomputer to perform IEBus operations without interrup-
tion. It also contains an IEBus driver and receiver, allowing it to directly connected to the bus.
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 LSB
• ^{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
µPD72042BGT
Package
16-pin plastic SOP (9.53 mm (375))
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. S13990EJ3V0DS00 (3rd edition)
The mark shows major revised points.
Date Published August 2002 N CP(K)
Printed in Japan
©
1995