7480 Datasheet, PDF (37/98 Pages) Bi technologies – 7/8 Diameter 5-Turn Wirewound Precision Potentiometer

PRELIMINARY _{NSootimcee: pTahriasmisentroict} ^{alimfinitsalasrpeescuifbicjeactitotno. change.}
Application Example
Priority Control at Simplified SAEJ1850
At simplified SAEJ1850 communication, when multiple units start
to transmit data at the same time, priority control is exerted.
On the LAN data bus, the “H” level has priority over the “L” level.
When an “H” level collides with an “L” level, the LAN data bus sta-
tus goes to the “H” level.
For example, when unit A outputs “H” and unit B outputs “L” at the
same time in Figure 37, the LAN data bus goes to “H”. Accord-
ingly, unit A takes priority of control and continues its transmission,
and unit B stops its transmission immediately.
In this way, the 7480/7481 group exerts priority control for each bit
and finally allows only the highest-priority unit to transmit data.
BUS+
BUS-
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
LAN data bus
Unit
Unit
A
B
Unit A
Unit B
LAN data bus
Fig. 37 Priority control at simplified SAEJ1850
Continue to transmit
Stop transmitting
Data collision
36