HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 340

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Notes: 1. When switching from transmission to simultaneous transmission/reception, check that
10.3.6
The multiprocessor communication function enables data to be exchanged among a number of
processors on a shared communication line. Serial data communication is performed in
asynchronous mode using the multiprocessor format (in which a multiprocessor bit is added to the
transfer data).
In multiprocessor communication, each receiver is assigned its own ID code. The serial
communication cycle consists of two cycles, an ID transmission cycle in which the receiver is
specified, and a data transmission cycle in which the transfer data is sent to the specified receiver.
These two cycles are differentiated by means of the multiprocessor bit, 1 indicating an ID
transmission cycle, and 0, a data transmission cycle.
The sender first sends transfer data with a 1 multiprocessor bit added to the ID code of the receiver
it wants to communicate with, and then sends transfer data with a 0 multiprocessor bit added to the
transmit data. When a receiver receives transfer data with the multiprocessor bit set to 1, it
compares the ID code with its own ID code, and if they are the same, receives the transfer data
sent next. If the ID codes do not match, it skips the transfer data until data with the multiprocessor
bit set to 1 is sent again.
In this way, a number of processors can exchange data among themselves.
Figure 10.21 shows an example of communication between processors using the multiprocessor
format.
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2. When switching from reception to simultaneous transmission/reception, check that
Multiprocessor Communication Function
SCI3 has finished transmitting and that bits TDRE and TEND are set to 1, clear bit TE
to 0, and then set bits TE and RE to 1 simultaneously with a single instruction.
SCI3 has finished receiving, clear bit RE to 0, then check that bit RDRF and the error
flags (OER, FER, and PER) are cleared to 0, and finally set bits TE and RE to 1
simultaneously with a single instruction.