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(2) Interrupt mask flag registers (MK0L, MK0H)
The interrupt mask flag is used to enable/disable the corresponding maskable interrupt service and the standby
clear.
MK0L and MK0H are set with a 1-bit or 8-bit memory manipulation instruction. When MK0L and MK0H are used
together as a 16-bit register MK0, they are set with a 16-bit memory manipulation instruction.
RESET input sets these registers to FFH.
Symbol
MK0L
TMMK3 CSIMK1 CSIMK0 PMK3
MK0H
Note
WTMK flag controls standby mode clear enabled/disabled. The interrupt function does not control.
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Cautions 1. If TMMK4 flag is read when a watchdog timer is used in watchdog timer mode 1, MK0 value
CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
Figure 18-3. Interrupt Mask Flag Register Format
<7>
<6>
<5>
<4>
7
6
<5>
4
1
1
Note
1
WTMK
becomes undefined.
2. Because port 0 is also used for the external interrupt request input, when the output level is
changed by specifying the output mode of the port function, an interrupt request flag is set.
Therefore, 1 should be set in the interrupt mask flag before using the output mode.
3. Be sure to set bits 4, 6, and 7 of MK0H to 1.
<3>
<2>
<1>
<0>
PMK2
PMK1
PMK0 TMMK4
<3>
<2>
<1>
<0>
ADMK TMMK2 TMMK1 TMMK0
Address
When Reset
R/W
FFE4H
FFH
R/W
FFE5H
FFH
R/W
××MK
Interrupt Servicing, Standby Mode Control
0
Interrupt servicing, standby mode clear
enabled
1
Interrupt servicing, standby mode clear
disabled
453
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