Datasheet

RL78/L12 CHAPTER 18 KEY INTERRUPT FUNCTION
R01UH0330EJ0200 Rev.2.00 726
Dec 13, 2013
18.3 Register Controlling Key Interrupt
The key interrupt function is controlled by the following five registers:
• Key return control register (KRCTL)
• Key return mode register 0 (KRM0)
• Key return flag register (KRF)
• Port mode registers 1, 3, 7, and 14 (PM1, PM3, PM7, PM14)
Note
Note The port mode registers (PMxx) to be set differ depending on the product. For details, see 18.3.4 Port mode
registers 1, 3, 7, 14 (PM1, PM3, PM7, PM14).
18.3.1 Key return control register (KRCTL)
This register controls the usage of the key interrupt flags (KRF0 to KRF3) and sets the detection edge.
The KRCTL register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 18-2. Format of Key Return Control Register (KRCTL)
Address: FFF34H After reset: 00H R/W
Symbol 7 6 5 4 3 2 1 0
KRCTL KRMD 0 0 0 0 0 0 KREG
KRMD Usage of t key interrupt flags (KRF0 to KRF3)
0 Does not use key interrupt flags
1 Uses key interrupt flags
KRMD Selection of Detection Edge (KR0 to KR3)
0 Falling edge
1 Rising edge