UPD78F0411GA-GAM-AX Datasheet, PDF (456/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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
KRM0
KRM3
KRM4
Description
Controls KR0 signal in 1-bit units.
Controls KR3 signal in 1-bit units.
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
Control register
Configuration
Key return mode register (KRM)
Figure 18-1. Block Diagram of Key Interrupt
KR4
INTKR
KR3
KR0
0 0 0 KRM4 KRM3 0 0 KRM0
Key return mode register (KRM)
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User’s Manual U18698EJ1V0UD