E202075_HD404889 Datasheet, PDF (47/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Interrupt enable flag (IE: $000,0):
The interrupt enable flag controls interrupt enabling/disabling of all interrupt requests as shown in table 4.
The interrupt enable flag is reset by interrupt handling and set by the RTNI instruction.
Table 4 Interrupt Enable Flag (IE: $000,0)
Interrupt Enable Flag(IE)
0
1
Interrupt Enabling/Disabling
Interrupts disabled
Interrupts enabled
Wakeup interrupt request flag (IFWU: $000,2):
The wakeup interrupt request flag (IFWU) is set by the detection of a falling edge in WU₀ to WU₃ input in
active mode, subactive mode,watch mode, or standby mode. In stop mode, when a falling edge is detected
at the wakeup pin, the MCU waits for the oscillation settling time, then switches to active mode. The
wakeup interrupt request flag (IFWU) is not set in this case.
Wakeup interrupt mask (IMWU: $000,3):
This bit masks an interrupt request by the wakeup interrupt request flag.
Edge detection select register (ESR: $006)
Bit
3
2
Read/Write
—
—
Initial value on reset
—
—
Bit name
—
—
1
W
0
ESR1
0
W
0
ESR0
ESR1
0
1
ESR0
0
1
0
1
INT1edge detect
Not detected
Falling edge detection
Rising edge detection
Both rising and falling edge detection
Figure 12 Edge Detection Select Register (ESR)
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