216
Chapter 8
Interrupt/Exception Processing Function
Preliminary User’s Manual U15839EE1V0UM00
8.3.4 Interrupt control register (xxIC)
An interrupt control register is assigned to each interrupt request (maskable interrupt) and sets the con-
trol conditions for each maskable interrupt request.
This register can be read/written in 8-bit or 1-bit units.
Figure 8-10:
Interrupt Control Register (xxIC)
Remark:
xx: Identification name of each peripheral unit (WT, TMD, P, TMG, GCC, AD, MAC, FC, CSI,
UART, DMA)
The address and bit of each interrupt control register are shown in the following Table 8-2, “Addresses
and Bits of Interrupt Control Registers,” on page 217.
7
6
5
4
3
2
1
0
Address
Initial
value
xxIC
xxIF
xxMK
0
0
0
xxPR2
xxPR1
xxPR0
FFFFF110H
to FFFF18EH
47H
Bit Position
Bit Name
Function
7
xxIF
This is an interrupt request flag.
0: Interrupt request not issued
1: Interrupt request issued
The flag xxIFn is reset automatically by the hardware if an interrupt request is acknowl-
edged.
6
xxMK
This is an interrupt mask flag.
0: Enables interrupt processing
1: Disables interrupt processing (pending)
2 to 0
xxPR2 to
xxPR0
8 levels of priority order are specified for each interrupt.
xxPR2
xxPR1
xxPR0
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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