Write Sequence For Message Transmitting; Flag Control Timing - Toshiba AS311 User Manual

5.3 Write sequence for message transmitting

5.3.1

Flag control timing

In case of transmitting a message, the following flags are used for handshaking
between T3 and AS311. These flags are the bits of the I/O registers assigned to the
AS311. Refer to section 4.1.
Write ready
Transmit complete
Transmit error
Transmit start
The message transmitting procedure is as follows. It is called "write sequence for
message transmitting".
Normal transmitting
AS311 sends out the message and
sets Transmit complete to ON
T3 resets Transmit start to OFF
AS311 resets Transmit complete to
OFF, and sets Write ready to ON
Bit F of XW(n) for channel 1 or XW(n+1) for channel 2
Bit E of XW(n) for channel 1 or XW(n+1) for channel 2
Bit D of XW(n) for channel 1 or XW(n+1) for channel 2
Bit F of YW(n+2) for channel 1 or YW(n+3) for channel 2
T3 checks Write ready is ON
T3 writes a message into buffer
memory (transmitting data area)
by WRITE instruction
T3 sets Transmit start to ON
AS311 resets Write ready to OFF
5. Operation Procedure
Transmitting error
AS311 sets the error information into
buffer memory (parameter area) and
sets Transmit error to ON
T3 reads the error information from
buffer memory (parameter area)
by READ instruction, and resets
Transmit start to OFF
AS311 resets Transmit error to OFF,
and sets Write ready to ON
User's Manual
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