7480 datasheet(37/98 Pages) RENESAS

tên linh kiện	7480

Giải thích chi tiết về linh kiện	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PDF	98 Pages

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MITSUBISHI MICROCOMPUTERS

7480/7481 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PRELIMINAR

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

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.

7480 bảng dữ liệu(PDF) 37 Page - Renesas Technology Corp