User’s Manual U16899EJ2V0UD
374
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 rising
edge to the key interrupt input pins (KR0 to KR7).
Table 18-1. Assignment of Key Interrupt Detection Pins
Flag Description
KRM0
Controls KR0 signal in 1-bit units.
KRM1
Controls KR1 signal in 1-bit units.
KRM2
Controls KR2 signal in 1-bit units.
KRM3
Controls KR3 signal in 1-bit units.
KRM4
Controls KR4 signal in 1-bit units.
KRM5
Controls KR5 signal in 1-bit units.
KRM6
Controls KR6 signal in 1-bit units.
KRM7
Controls KR7 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)
KRM7 KRM6 KRM5 KRM4 KRM3 KRM2 KRM1 KRM0
KR7
KR6
KR5
KR4
KR3
KR2
KR1
KR0