UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 516

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

20.3 Register Controlling Key Interrupt
516
(1) Key return mode register (KRM)
Cautions 1. If any of the KRM0 to KRM7 bits used is set to 1, set bits 0 to 7 (PU70 to PU77) of the
This register controls the KRM0 to KRM7 bits using the KR0 to KR7 signals, respectively.
KRM is set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets 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.
Symbol
Address: FF6EH
KRM
corresponding pull-up resistor register 7 (PU7) to 1.
then change the KRM register. Clear the interrupt request flag and enable interrupts.
KRMn
KRM7
Figure 20-2. Format of Key Return Mode Register (KRM)
0
1
7
Does not detect key interrupt signal
Detects key interrupt signal
After reset: 00H
KRM6
CHAPTER 20 KEY INTERRUPT FUNCTION
6
User’s Manual U17260EJ6V0UD
KRM5
5
R/W
KRM4
Key interrupt mode control
4
KRM3
3
KRM2
2
KRM1
KRM0
0