HD404669 Datasheet, PDF (28/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
Detection edge selection register 2 (ESR2: $027)
Bit
Initial value
Read/Write
Bit name
3
0
W
ESR23
2
0
W
ESR22
1
0
W
ESR21
0
0
W
ESR20
ESR23 ESR22
0
0
1
1
0
1
EVND detection edge
ESR21 ESR20
No detection
0
0
Falling-edge detection
1
Rising-edge detection
1
0
Falling/Rising-edge detection
1
INT₄ detection edge
No detection
Falling-edge detection
Rising-edge detection
Falling/Rising-edge detection
Figure 13 Detection Edge Selection Register 2 (ESR2)
Table 5 External Interrupt Request Flags (IF0–IF4: $000, $001, $022, $023)
IF0–IF4
0
1
Interrupt Request
No
Yes
External Interrupt Masks (IM0–IM4: $000, $001, $022, $023): Prevent (mask) interrupt requests
caused by the corresponding external interrupt request flags, as listed in table 6.
Table 6 External Interrupt Masks (IM0–IM4: $000, $001, $022, $023)
IM0–IM4
0
1
Interrupt Request
Enabled
Disabled (masked)
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