IC89E54 Datasheet, PDF (12/36 Pages) Integrated Circuit Solution Inc – 8-BITS SINGLE MICROCONTROLLER with 16/32/64-Kbytes of FLASH, 256 byte +512 byte RAM

IC89E54/58/64
XICON(C0H)
B7
B6
B5
B4
B3
B2
B1
B0
Flag Name PX3
EX3
IE3
IT3
PX2
EX2
IE2
IT2
Bit Name
7
PX3
6
EX3
5
IE3
4
IT3
3
PX2
2
EX2
1
IE2
0
IT2
Description
External interrupt 3 priority high if set.
External interrupt 3 enable if set.
If IT3=1, IE3 is set/cleared automatically by hardware when interrupt is detected/serviced.
External interrupt 3 is falling-edge/low-level triggered when this bit is set/cleared by software.
External interrupt 2 priority high if set.
External interrupt 2 enable if set.
If IT2=1, IE2 is set/cleared automatically by hardware when interrupt is detected/serviced.
External interrupt 2 is falling-edge/low-level triggered when this bit is set/cleared by software.
EA
INT0
TF0
INT1
TF1
RI/TI
TF2/EXF2
INT2
INT3
IT0
IE0
EX0
ET0
IE1
IT1
EX1
ET1
ES
XICON.0
XICON.2
XICON.3
XICON.6
ET2
EX2
EX3
PX0
PT0
PX1
PT1
PS
PT2
IT2
IT3
Figure 10. IC89E54/58/64 Interrupt Architecture
These descriptions are added from standard 80C32. So, more detailed information for interrupts refer to IC80C52.
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Integrated C ircuitSolution Inc.
MC012-0C 11/16/2001