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Description of the data path
OSCAR Technical Manual V2.4.0
99
To read data:
1. Query RDRD flag (buffer ready?) and write the number of bytes the host
wants to read to RBUF_CNT.
2. Read the number of bytes pending in the receive buffer RBUF_ST (more
data in the buffer than the host wanted to read?) and the number of
bytes left for reading from the receive FIFO in RBUF_CNT (more data the
host wanted to read than were in the buffer?).
3. Read received characters from SIO_DATA_REGISTER, beginning at char 0.
4. To input more characters, repeat from step 1.
To write data:
1. Query TDRD flag (buffer ready?) and write the number of bytes to send
(copied from SIO register to transmit FIFO) to TBUF_CNT.
2. Read the available data space left in TBUF_ST (if the buffer can hold
more bytes than are to be transmitted) and number of bytes written to
transmit buffer in TBUF_CNT (if more data is to be transmitted than fits
in the buffer).
3. Write character to SIO_DATA_REGISTER, beginning at char 0.
4. To output more characters, repeat from step 1.
Note
L
• Contact your local dealer, if you require further infor-
mation or additional test programs or software.
• AVT recommends the use of Hyperterminal™ or other
communication programs to test the functionality of
this feature. Alternatively use SmartView to try out this
feature.