Fujitsu F2MC-16LX MB90580 Series Hardware Manual page 201

(4) Master transmit routine
After the communication inhibit state is released, the unit won the arbitration and acts as master. Then
master transmit routine is used to transmit data to the slave. This routine is executed inside interrupt
routine with ST3-0 bits (upper 2 bits are 00) in status register indicating the status as master transmit has
been set.
Transmission ends without
all data being transmitted
Note1: The reason for the abnormal termination of transmission can be known by
reading the TE, PEF and ACK bits of status register. The remaining data
that can't be transmitted will be sent out when GOTM bit in command reg-
ister CMRH is written '1' again.
In order to stop the master transmit and clear the WDB, the bit WDBC in
CMRL is written '1'.
Note2: Please do not wrtie WDB when WDBF=1
Note3: N is the number of data byte for master transmit
MB90580 Series
Status register read
Y
ST3-0 = 3H?
Note1
ST3-0 = 0H?
ST3-0 = 2H?
Begin
N
Y
N
Set multiaddress, control bits
sand telegraph length bits
Note2
N
N = 0?
Y
Note2
N
Y
End
13.5 Operation
Y
WDBF = 1?
N
Setup master
WDB write
transmit data
Done by
N = N-1
Chapter 13: IE Bus 181