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7480 Datasheet(PDF) 37 Page - Renesas Technology Corp

Part # 7480
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  98 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7480 Datasheet(HTML) 37 Page - Renesas Technology Corp

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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
36
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Fig. 37 Priority control at simplified SAEJ1850
BU S+
BU S-
Unit
A
Unit
B
Unit A
LAN data bus
Unit B
Continue to transmit
Stop transmitting
Data collision
LAN data bus
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.



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