Toshiba CD332 user manual Interrupt assignment

4. I/O Allocation

4.2 Interrupt assignment

The T3 has 8 I/O interrupt programs, I/O#1 to I/O#8.

If one interrupt generation module (CD332) is used, the I/O#1 program is assigned to the CD332. And the I/O#1 is activated when the CD332 generates an interrupt.

If two or more (up to 8) interrupt generation modules (CD332, etc.) are used, the interrupt programs are assigned sequentially from the module allocated closest to the T3 CPU.

For example, if 3 CD332s are used, the I/O#1, I/O#2 and I/O#3 are assigned sequentially as follows.

T3 basic unit

0					1		2	3	4	5	6		7	8	9
P		I	C	C						C
S	F		P	D		General				D		General
			U	3						3
				3			I/O			3			I/O
				2						2

Expansion unit

0 1 2 3 4 5 6 7 8 9 10

P	I	C
S	F	D	General
		3
		3		I/O
		2

I/O#1 I/O#2 I/O#3

As for the interrupt priority, the interrupt generation module which is allocated closest to the T3 CPU has highest priority and followed by this order.

NOTE In default, the T3’s I/O interrupt program and the interrupt generation module are related as mentioned above. However user can change this relation (assignment) by using the interrupt assignment function of the T3.

For this function, refer to the T3 User’s Manual - Function.

20 Change Detect DC Input Module (CD332)