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Z51F6412
Product Specification
PS030302-0212
P R E L I M I N A R Y
56
IP1[7:0]
IP1x IPx Description
0 0 level
0
(lowest)
0 1 level
1
1 0 level
2
1 1 level
3
(highest)
EIFLAG (External Interrupt Flag Register) : A4H
7
6
5
4
3
2
1
0
FLAG7
FLAG6
FLAG5
FLAG4
FLAG3
FLAG2
FLAG1
FLAG0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value : 00H
FLAG[7:0]
If External Interrupt is occurred, the flag becomes ‘1’. The flag can
be cleared by writing a ‘0’ to bit
0
External Interrupt not occurred
1
External Interrupt occurred
EIEDGE (External Interrupt Edge Register) : A5H
7
6
5
4
3
2
1
0
EDGE7
EDGE6
EDGE5
EDGE4
EDGE3
EDGE2
EDGE1
EDGE0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value : 00H
EDGE[7:0]
Determines which type of edge or level sensitive interrupt may occ
ur.
0 Level
(default)
1 Edge
EIPOLA (External Interrupt Polarity Register) : A6H
7
6
5
4
3
2
1
0
POLA7
POLA6
POLA5
POLA4
POLA3
POLA2
POLA1
POLA0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value : 00H
POLA[7:0]
According to EIEDGE, External interrupt polarity register has a
different means. If EIEDGE is level type, external interrupt polarity
is able to have Low/High level value. If EIEGDE is edge type,
external interrupt polarity is able to have rising/ falling edge value.
Level
case:
0
When High level, Interrupt occurred (default)
1
When Low level, Interrupt occurred
Edge
case:
0
When Rising edge, Interrupt occurred (default)
1
When Falling edge, Interrupt occurred
EIBOTH (External Interrupt Both Edge Enable Register) : A7H
7
6
5
4
3
2
1
0
BOTH7
BOTH 6
BOTH 5
BOTH 4
BOTH 3
BOTH 2
BOTH 1
BOTH 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value : 00H