I2Os (Intelligent I/O Service); Notes On Use; Application; Figure 12.4.8A Sample System Configuration In Mode 1 - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

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12.4.6 I OS (Intelligent I/O service)
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For I OS, see the section describing I

12.4.7 Notes on use

To set a communication mode, ensure that UART is not in operation. The data sent or received during
mode setting is not guaranteed.

12.4.8 Application

Mode 1 is used when two or more slave CPUs are connected to a single host CPU (see Figure 12.4.8a).
This resource only supports the host side communication interface.
Host CPU
Communication starts when the host CPU transfers address data. Address data means the data used
when '1' is set in A/D of the SCR register. The address data determines the destination slave CPU and
enables communication between the host and slave CPUs. Ordinary data means the data used when '0' is
set in A/D of the SCR register. Figure 12.4.8b shows the flowchart.
In mode 1, the parity check function cannot be used. Therefore, set '0' in the PEN bit of the SCR register.
MB90580 Series
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OS.
SO
SI
SO
Slave CPU #0

Figure 12.4.8a Sample system configuration in mode 1

SI SO
Slave CPU #1
12.4 Operations
SI
Chapter 12: UART 139