ml670100 Oki Semiconductor, ml670100 Datasheet - Page 59

• Manufacturer Part Number: ml670100
• Description: Ml670100 Is A High-performance 32-bit Microcontroller
• Manufacturer: Oki Semiconductor

4.3.5
The External IRQ Control Register (EIRCON) is an 8-bit read/write register specifying the
detection methods ("L" level sensing or falling edge sensing) for external interrupt requests
from the nEIR[7:0] pins.
After a system reset, it contains 0x00.
EIRn (n=0 - 7)
EIRn (n=0 - 7) controls the detection method for the external interrupt request signal from
External Interrupt n pin (nEIR[n], n=0 - 7). Setting it to "1" specifies falling edge sensing;
resetting it to "0," "L" level sensing. When it detects the specified input, the interrupt controller
sets the corresponding bit in Interrupt Request Register 3 (IRR3) to "1."
External IRQ Control Register (EIRCON)
Bit Descriptions
EIR7 EIR6 EIR5 EIR4 EIR3 EIR2 EIR1 EIR0
7
6
Figure 4.6 : External IRQ Control Register (EIRCON)
5
4
3
2
EIRn
(n=0-7)
1
0
1
0
Detection methods
Use "L" level sensing for nEIR[n] input
Use falling edge sensing for nEIR[n] input
4-11