Selecting The Data Exchange Method - Omron C200H-ASC11 Manual

Selecting the Data Exchange Method

6-2

Selecting the Data Exchange Method

Data Read/write data is
read/write in
not affected by I/O
words.
refresh when the
CPU Unit is a
C200HX/HG/HE or
CS1-series PC.
Data access at I/O
refresh, or
read/write large
volume of data, or
if the CPU Unit is
other than a
C200HX/HG/HE or
CS1-series PC.
Read/write
data in bit(s).
74
CPU Unit and ASCII
Asyn- Unit asynchronously
chro-
read/write to ASCII
nous
Unit's shared
memory (to speed up
ASCII Unit
processing).
On a trigger from the
ASCII Unit, the CPU
Unit reads/writes I/O
ASCII
to memory data to the
Syn-
CPU
ASCII Unit when the
chro-
IOWR/IORD (#FD00)
nous
instruction is
(High-spe- executed.
ed data
exchange
possib l e)
The CPU Unit sends
an interrupt to the
ASCII Unit, and
reads/writes to the
CPU
shared memory via
to
the PC EGET/PC
ASCII
EPUT commands in
the ASCII Unit
interrupt subroutine .
The CPU Unit
reads/writes the
ASCII Unit's shared
memory.
On a trigger from the
CPU Unit, the ASCII
Unit reads/writes the
CPU
memory (255 words
to
ASCII
max.).
The ASCII Unit
reads/writes the CPU
ASCII
Unit's memory
alone
independently (255
words max.).
CPU Unit ASCII Unit
YES
IOWR (#00@@) PC EGET
IORD (#00@@) PC EPUT
Asynchronous
(Do not need to be
specified in pairs .)
YES
IOWR (#FD00) PC QREAD@
IORD (#FD00) PC QWRITE@
IOWR (#00@@)
IORD (#00@@)
+
YES
ON PC GOSUB
IOWR (#CC00)
(interrupt)
PC EGET
PC EPUT
YES
MOV PC READ
PC WRITE
YES
None PC READ@
PC WRITE@
MOV PC PUT
LD PC GET
Section 6-2
Data exchange
method number
4., 5.
6.
7., 8.
1.
2.
3.