CHAPTER 15 INTERRUPT FUNCTIONS
User’s Manual U13045EJ2V0UM00
208
(2) Interrupt mask flag registers (MK0, MK1)
The interrupt mask flag is used to enable/disable the corresponding maskable interrupt service.
MK0 and MK1 are set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets these registers to FFH.
Figure 15-3. Interrupt Mask Flag Register Format
Cautions 1. If the TMMK4 flag is read when the watchdog timer is used in watchdog timer mode 1
and 2, its value becomes undefined.
2. Because port 2 has an alternate function as the external interrupt input, when the output
level is changed by specifying the output mode of the port function, an interrupt request
flag is set. Therefore, the interrupt mask flag should be set to 1 before using the output
mode.
0
1
TMMK20 TMMK80 STMK20 SRMK20 PMK2 PMK1 PMK0 TMMK4
MK0
R/W
FFE4H
FFH
R/W
Symbol
Address
After reset
Interrupt servicing control
Interrupt servicing enabled
Interrupt servicing disabled
<6>
<5>
<4>
<3>
<2>
<1>
<7>
<0>
××
MK
×
1
1
1
1
1
1
1
ADMK0
MK1
R/W
FFE5H
FFH
R/W
Symbol
Address
After reset
6
5
4
3
2
1
7
<0>
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