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6.Programming Information
6.6.4I/O interrupt programs
The I/O interrupt program is also the highest priority task. It is executed immediately when the interrupt factor is generated, with suspending other operation.
the following 4 types I/O interrupt programs are supported in the T1/T1S.
(1)I/O interrupt #1
The I/O interrupt #1 is used with the high speed counter function. When the count value reaches the preset value, etc., the I/O interrupt #1 is activated immediately with suspending other operation. The end of the I/O interrupt #1 is recognized by the IRET instruction. For detailed information, refer to section 8.3.
(2)I/O interrupt #2
The I/O interrupt #2 is also used with the high speed counter function. Refer to section 8.3 for details.
(3)I/O interrupt #3
The I/O interrupt #3 is used with the interrupt input function. When the state of the interrupt input is changed from OFF to ON (or ON to OFF), the I/O interrupt #3 is activated immediately with suspending other operation. The end of the I/O interrupt #3 is also recognized by the IRET instruction. For detailed information, refer to section 8.4.
(4)I/O interrupt #4
The I/O interrupt #4 is also used with the interrupt input function. Refer to section 8.4 for details.
If an interrupt factor is generated while other interrupt program is executing (including the timer interrupt), the interrupt factor is held. Then it will be activated after finishing the other interrupt program execution.
If two or more interrupt factors are generated at the same time, the priority is as follows.
Timer > I/O #1 > I/O #2 > I/O #3 > I/O #4
114 T1/T1S User’s Manual
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