UPD78F0413GA-GAM-AX NEC, UPD78F0413GA-GAM-AX Datasheet - Page 455

• Manufacturer Part Number: UPD78F0413GA-GAM-AX
• Description: 8BIT UC, 32K FLASH, 1KB RAM, LCD
• Manufacturer: NEC

Specifications of UPD78F0413GA-GAM-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 30
• Ram Memory Size: 1024Byte
• Cpu Speed: 10MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 32KB
• Oscillator Type: External, Internal

18.3 Register Controlling Key Interrupt
(1) Key return mode register (KRM)
Cautions 1. If any of the KRM0, KRM3, or KRM4 bits used is set to 1, set bit 0 (PU40) of the
This register controls the KRM0, KRM3, and KRM4 bits using the KR0, KR3, and KR4 signals, respectively.
KRM is set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears KRM to 00H.
2. If KRM is changed, the interrupt request flag may be set. Therefore, disable interrupts and
3. The bits not used in the key interrupt mode can be used as normal ports.
4. When using the P40/KR0/V
Symbol
Address: FF6EH
KRM
corresponding pull-up resistor register 4 (PU4), or bits 2 or 3 (PU12 or PU13) of the
corresponding pull-up resistor register 1 (PU1) to 1.
then change the KRM register. Clear the interrupt request flag and enable interrupts.
mode register (LCDM) to a setting other than the 1/4 bias method. When the pin is set to the
1/4 bias method, it is used as V
KRMn
Figure 18-2. Format of Key Return Mode Register (KRM)
0
1
7
0
Does not detect key interrupt signal
Detects key interrupt signal
After reset: 00H
CHAPTER 18 KEY INTERRUPT FUNCTION
6
0
User’s Manual U18698EJ1V0UD
LC3
5
0
Key interrupt mode control (n = 0, 3, or 4)
pin for the key interrupt function (KR0), set the LCD display
LC3
R/W
.
KRM4
4
KRM3
3
2
0
0
KRM0
0
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