CHAPTER 10 INTERRUPT FUNCTIONS
User's Manual U11919EJ3V0UM00
154
(2)
Interrupt mask flag registers (MK0 and MK1)
The interrupt mask flag is used to enable/disable the corresponding maskable interrupt servicing.
MK0 and MK1 are set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets MK0 and MK1 to FFH.
Figure 10-3. Interrupt Mask Flag Register Format
0
1
1
TMMK00 STMK00 SRMK00
PMK2
PMK1
PMK0
TMMK4
MK0
R/W
FFE4H
FFH
R/W
Symbol
Address
After Reset
Interrupt Servicing Control
Interrupt servicing enabled
Interrupt servicing disabled
××
MK
×
<6>
<5>
<4>
<3>
<2>
<1>
7
<0>
TMMK20
1
1
1
1
1
1
KRMK00
MK1
FFE5H
FFH
R/W
6
5
4
3
2
1
<7>
<0>
Cautions 1. Be sure to set bit 7 of MK0 and bits 1 to 6 of MK1 to 1.
2. IF the TMMK4 flag is read when a watchdog timer is used in watchdog timer mode 1 or
2, its value becomes undefined.
3. Because port 3 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, 1 should be set in the interrupt mask flag
before using the output mode.
Содержание mPD789026 Subseries
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