Datasheet

User’s Manual U18698EJ1V0UD
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CHAPTER 18 KEY INTERRUPT FUNCTION
18.1 Functions of Key Interrupt
A key interrupt (INTKR) can be generated by setting the key return mode register (KRM) and inputting a falling
edge to the key interrupt input pins (KR0, KR3, and KR4).
Table 18-1. Assignment of Key Interrupt Detection Pins
Flag Description
KRM0 Controls KR0 signal in 1-bit units.
KRM3 Controls KR3 signal in 1-bit units.
KRM4 Controls KR4 signal in 1-bit units.
18.2 Configuration of Key Interrupt
The key interrupt includes the following hardware.
Table 18-2. Configuration of Key Interrupt
Item Configuration
Control register Key return mode register (KRM)
Figure 18-1. Block Diagram of Key Interrupt
INTKR
Key return mode register (KRM)
0
0
0 KRM4 KRM3 0 0 KRM0
KR4
KR3
KR0