Omron SYSMAC C200H-ASC02 Operation Manual page 126

PC Statements and Refresh Timing
PC WRITE @...
Data is transferred to the PC during the first I/O refresh after execution of PC WRITE @..., irrespective of the
status of the PC READ flag.
I/O refresh
C200H CPU
ASCII Unit
ASCII busy
(word n+3 bit 00)
ON PC GOSUB
After the ON PC GOSUB statement is executed, the PC's interrupt number is written in. When the Write flag is
set, the GOSUB statement is executed. Only when the WRITE flag is set will the ON PC GOSUB statement
be executed.
I/O Refresh
C200H CPU
ASCII Unit
ON PC GOSUB Statement Execution
Interrupt Number
(word n bits 04 through 07)
WRITE Flag (word n bit 01)
ASCII Unit (word n+3 bit 00)
120
I/O refresh
Instruction execution
WRITE
PC WRITE @...statement
I/O Refresh
Instruction Execution
I/O refresh
Instruction execution
I/O Refresh
Instruction Execution
ON PC GOSUB Statement Execution
Appendix C
Instruction execution
I/O Refresh
Instruction Execution