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CHAPTER 22 INTERRUPT FUNCTIONS
User’s Manual U12697EJ3V0UM
22.3.6 Interrupt selection control register (SNMI)
SNMI selects whether to use and interrupt request signals from the watchdog timer inputs from the P02 pin as
maskable interrupt signals or non-maskable interrupts.
Since the bit of this register can be set (1) only once after reset, the bit should be cleared (0) by reset.
SNMI is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears SNMI to 00H.
Figure 22-6. Format of Interrupt Selection Control Register (SNMI)
SNMI
0
7
6
5
4
3
2
1
0
0
0
0
0
SWDT
0
SNMI
SWDT
0
1
SNMI
0
1
Use as NMI.
Interrupt servicing cannot be disabled with interrupt mask register.
At this time, release of the standby mode with the P02 pin is
accomplished with NMI.
Address: 0FFA9H
R/W
After reset: 00H
Symbol
Watchdog timer interrupt selection
Use as non-maskable interrupt.
Interrupt servicing cannot be disabled with interrupt mask register.
Use as maskable interrupt.
Vectored interrupts and macro service can be used. Interrupt
servicing can be disabled with interrupt mask register.
P02 pin function selection
Use as INTP2.
Vectored interrupts and macro service can be used.
Interrupt servicing can be disabled with interrupt mask register.
At this time, the standby mode with the P02 pin is accomplished
with a maskable interrupt.
