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Chapter 7
Interrupt/Exception Processing Function
User’s Manual U16580EE3V1UD00
7.3.6 In-service priority register (ISPR)
The ISPR register holds the priority level of the maskable interrupt currently acknowledged. When an
interrupt request is acknowledged, the bit of this register corresponding to the priority level of that
interrupt request is set to 1 and remains set while the interrupt is serviced.
When the RETI instruction is executed, the bit corresponding to the interrupt request having the highest
priority is automatically reset to 0 by hardware. However, it is not reset to 0 when execution is returned
from non-maskable interrupt servicing or exception processing.
Reset input clears this register to 00H.
This register is read-only, in 8-bit or 1-bit units.
Caution:
In the interrupt enabled (EI) state, if an interrupt is acknowledged during the reading
of the ISPR register, the value of the ISPR register may be read after the bit is set (1)
by this interrupt acknowledgment. To read the value of the ISPR register properly
before interrupt acknowledgment, read it in the interrupt disabled (DI) state.
Figure 7-13:
Interrupt Service Priority Register (ISPR)
Remark:
n = 0 to 7 (priority level)
After reset:
00H
R
Address:
FFFFF1FAH
7
6
5
4
3
2
1
0
ISPR
ISPR7
ISPR6
ISPR5
ISPR4
ISPR3
ISPR2
ISPR1
ISPR0
ISPRn
Priority of Interrupt Currently Being Acknowledged
0
Interrupt request with priority n is not acknowledged
1
Interrupt request with priority n is being acknowledged
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