Omron C200H-ASC11, Manual, Page: 80 / 301

71
Overview of Data Exchanges
Section 6-1
3. The CPU Unit and the ASCII Unit both access their own allocated words in
memory. (The ASCII Unit accesses its own data in 16-bit units via the PC
PUT/GET command.) The words allocated in the CPU Unit and memory
words in the ASCII Unit are exchanged during the I/O refresh period.
4. The ASCII Unit accesses its own shared memory via a PC EGET/EPUT
command. Asynchronously, the CPU Unit reads/writes the ASCII Unit’s
shared memory via an IORD (#00
@@
)/IOWR (#00
@@
) instruction. The
IORD (#00
@@
)/IOWR (#00
@@
) instructions are supported only by the
C200HX/HG/HE and CS1-series PCs.
I/O refresh
CPU Unit ASCII Unit
Allocated words
MOV PC PUT
PC GET
Allocated words
Shared
memory
CPU Unit ASCII Unit
Read/
write
Read/write
IOWR (#00
@@
)
IORD (#00
@@
)
PC EGET
PC EPUT