Iowr/Iord Instruction Specifications; Iowr Instruction (Special I/O Unit Write) - Omron C200H-ASC11 Manual

IOWR/IORD Instruction Specifications

Interrupt Failure (Same for PC Interrupt Bit Interrupts and IOWR (#CC00) Interrupts)
CPU Unit
ASCII Unit
PC Interrupt
Subroutine
Completed Flag
PC Interrupt
Fail Flag
PC Interrupt Subroutine Completed Flag Changes
Toggles at completion of
each PC interrupt
subroutine
PC Interrupt
Subroutine
Completed Flag
6-5

IOWR/IORD Instruction Specifications

6-5-1

IOWR Instruction (SPECIAL I/O UNIT WRITE)

1., 2.
MOV or OUT instruction
3.
Interrupt Enable Flag
PC Interrupt Number
Interrupt Fail
4. ON PC
GOSUB
IOWR (#CC00)
Start
(OFF to ON or ON to OFF)
n + 5
bit 01
Note The time chart shown here indicates the flag operations which are different
from the PC flag operations.
The IOWR/IORD instructions are available only with the C200HX/HG/HE and
CS1-series PCs. They cannot be used for ASCII Units on Slave Racks.
IOWR
The IOWR instruction can be used with the ASCII Unit in the following four
ways.
Finish Start
PC interrupt
subroutine
C
C: Control code
S: (First source word)
S
D: Destination Unit No., (No. of Transfer Words)
D
The parts inside parentheses change according
to the control code.
The Interrupt Fail Flag turns ON at the
next cycle after an interrupt is not
received from the PC even though the
PC Interrupt Bit has turned ON. It stays
ON for only one cycle, then turns OFF.
The PC Interrupt Fail Flag may turn ON
sooner for IOWR (#CC00) interrupts
because PC interrupt notification is
included in the instruction.
Finish
PC interrupt
subroutine
Section 6-5
95