Instruction manual

Description of the data path
Reading data requires the following series of actions:
• Query RDRD f g (buffer ready?) and writ f s the
RBUF_CNT.
• 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 want n w in the
• Read received characters from SIO_DATA_REGISTER, beginning at char
• To input more characters, repeat from step 1.
Writing data requires the following series of actions:
• Query TDRD flag (buffer ready?) and write the number of bytes to send (copied from SIO
register to transmit FiFo) to TBUF_CNT.
• Read the available data space left in TBUF_ST (in the case the buffer can hold more bytes
than are to t nsmit) and number of bytes ran buffe (in the
case that more data is to transmit than fits in the buffer).
• Write characte to SIO_DATA_REGISTER, begi r 0
• To output more characters, repeat from step 1.
 Contact your local dealer if you require further information or additional test programs or
software.
 AVT recommends the use of munication programs to test the
functionality of this feature.
la e the number o byte host wants to read to
ed to read tha ere buffer?).
0.
ra written to t smit r in TBUF_CNT
r nning at cha .
Hyperterminal™ or other com
MARLIN Technical Manual
Page 90