
701
Chapter 17
Interrupt/Exception Processing Function
User’s Manual U16702EE3V2UD00
17.3.4 Interrupt control register (xxICn)
An interrupt control register is assigned to each interrupt request (maskable interrupt) and sets the
control conditions for each maskable interrupt request.
This register can be read or written in 8-bit or 1-bit units.
Figure 17-10:
Interrupt Control Register (xxICn) Format
Note:
The flag xxlFn is reset automatically by the hardware if an interrupt request is acknowledged.
Remark:
xx: Identification name of each peripheral unit (Refer to
Table 17-2, “Interrupt Control
Register (xxICn),” on page 702
)
n: Peripheral unit number (Refer to
Table 17-2, “Interrupt Control Register (xxICn),” on
page 700
)
Caution:
Disable interrupts (DI) or mask the interrupt to read the xxICn bit.
If the xxIFn bit is read while interrupts are enable (EI) or while the interrupt is
unmasked, the correct value may not be read when acknowledging an interrupt are
reading the bit conflict.
The addresses and bits of the interrupt control registers are as follows.
After reset: 47H
R/W
Address: FFFFF110H to FFFFF18EH
<7>
<6>
5
4
3
2
1
0
xxICn
xxIFn
xxMKn
0
0
0
xxPRn2
xxPRn1
xxPRn0
xxIFn
Interrupt request flag
Note
0
Interrupt request not issued
1
Interrupt request issued
xxMKn
Interrupt mask flag
0
Interrupt servicing enabled
1
Interrupt servicing disabled (pending)
xxPRn2
xxPRn1
xxPRn0
Interrupt priority specification bit
0
0
0
Specifies level 0 (highest).
0
0
1
Specifies level 1.
0
1
0
Specifies level 2.
0
1
1
Specifies level 3.
1
0
0
Specifies level 4.
1
0
1
Specifies level 5.
1
1
0
Specifies level 6.
1
1
1
Specifies level 7 (lowest).
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