The input data status bit STAT will be reset
using this bit. When changing from 1 to 0
(falling edge) STAT will be reset from 0 to 1.
STAT = 0: All changes in the data fields
TX_BYTE_CNT, TX_CNT and RX_CNT_ACK
will be ignored. The receive or emission
memory can be scrubbed using RXBUF
FLUSH or TXBUF FLUSH respectively.
STAT = 1 or changing from 0 to 1: The
buffers cannot be scrubbed.
Enabling the Data Transfer
There are different ways to announce the communication module to the control. Using the
test mode copy the input data into the output data of the module so that the received data
will be sent again. Or select one of the function blocks provided by the engineering tool.
For programming, regard the following schemes showing the sequences for receiving and
transmission
Figure 148: Receiving
Sequence
Figure 149: Transmission Sequence
The status and control word values during various states of communication are provided in
the following table.
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