UPD78F0138 NEC, UPD78F0138 Datasheet - Page 378

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

378
18.1 Functions of Key Interrupt
edge to the key interrupt input pins (KR0 to KR7).
18.2 Configuration of Key Interrupt
A key interrupt (INTKR) can be generated by setting the key return mode register (KRM) and inputting a rising
The key interrupt includes the following hardware.
KR7
KR6
KR5
KR4
KR3
KR2
KR1
KR0
KRM7 KRM6 KRM5 KRM4 KRM3 KRM2 KRM1 KRM0
Key return mode register (KRM)
Control register
Table 18-1. Assignment of Key Interrupt Detection Pins
KRM0
KRM1
KRM2
KRM3
KRM4
KRM5
KRM6
KRM7
CHAPTER 18 KEY INTERRUPT FUNCTION
Item
Flag
Figure 18-1. Block Diagram of Key Interrupt
Table 18-2. Configuration of Key Interrupt
User’s Manual U16228EJ2V0UD
Controls KR0 signal in 1-bit units.
Controls KR1 signal in 1-bit units.
Controls KR2 signal in 1-bit units.
Controls KR3 signal in 1-bit units.
Controls KR4 signal in 1-bit units.
Controls KR5 signal in 1-bit units.
Controls KR6 signal in 1-bit units.
Controls KR7 signal in 1-bit units.
Key return mode register (KRM)
Description
Configuration
Edge detector
INTKR