Z51F3220FNX Datasheet, PDF (100/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
EIFLAG0 (External Interrupt Flag 0 Register) : C0H
7
6
5
4
FLAG7
FLAG6
FLAG5
FLAG4
R/W
R/W
R/W
R/W
3
FLAG3
R/W
2
FLAG2
R/W
1
FLAG1
R/W
0
FLAG0
R/W
Initial value : 00H
EIFLAG0[7:0]
When an External Interrupt 0-7 is occurred, the flag becomes ‘1’.
The flag is cleared only by writing ‘0’ to the bit. So, the flag should
be cleared by software.
0
External Interrupt 0 ~ 7 not occurred
1
External Interrupt 0 ~ 7 occurred
EIPOL0H (External Interrupt Polarity 0 High Register): A5H
7
6
5
4
3
2
POL7
POL6
POL5
R/W
R/W
R/W
R/W
R/W
R/W
1
0
POL4
R/W
R/W
Initial value: 00H
EIPOL0H[7:0]
External interrupt (EINT7, EINT6, EINT5, EINT4) polarity selection
POLn[1:0]
Description
0
0
No interrupt at any edge
0
1
Interrupt on rising edge
1
0
Interrupt on falling edge
1
1
Interrupt on both of rising and falling edge
Where n =4, 5, 6 and 7
EIPOL0L (External Interrupt Polarity 0 Low Register): A4H
7
6
5
4
3
2
POL3
POL2
POL1
R/W
R/W
R/W
R/W
R/W
R/W
1
0
POL0
R/W
R/W
Initial value: 00H
EIPOL0L[7:0]
External interrupt (EINT0, EINT1, EINT2, EINT3) polarity selection
POLn[1:0]
Description
0
0
No interrupt at any edge
0
1
Interrupt on rising edge
1
0
Interrupt on falling edge
1
1
Interrupt on both of rising and falling edge
Where n =0, 1, 2 and 3
PS029902-0212
PRELIMINARY
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