Z51F0410 Datasheet, PDF (71/184 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F0410
Product Specification
FLAG[1:0]
Initial value : 00H
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) : ADH
7
6
5
4
3
2
1
0
-
-
-
-
-
-
EDGE1
EDGE0
R/W-
R/W-
R/W-
R/W
R/W
R/W
R/W
R/W
Initial value : 00H
EDGE[1:0]
Determines which type of edge or level sensitive interrupt may occ
ur.
0
Level (default)
1
Edge
EIPOLA (External Interrupt Polarity Register) : AEH
7
6
5
4
3
2
1
0
-
-
-
-
-
-
POLA1
POLA0
R/W
R/W
R/W-
R/W
R/W
R/W
R/W
R/W
Initial value : 00H
POLA[1:0]
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
EIENAB (External Interrupt Enable Register) : AFH
7
6
5
4
3
2
-
-
-
-
-
-
R/W-
R/W-
R/W-
R/W
R/W
R/W
ENAB[1:0]
Control External Interrupt
0
disable (default)
1
enable
1
ENAB1
R/W
0
ENAB0
R/W
Initial value : 00H
PS029502-0212
PRELIMINARY
68