Epson Apex 386SX/16 Canadian Product User Manual - Page 117
System, Interrupt
View all Epson Apex 386SX/16 Canadian Product manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 117 highlights
The 8254-2 timer/counter is treated by system programs as an arrangement of four programmable external i/O ports. Three are treated as counters; the fourth is a control register for mode programming. System Interrupt Sixteen levels of system interrupts are provided by the 80386SX NMI and two 8259A interrupt controller chips. The following shows the interrupt-level assignments' decreasing priority: Table 6-4: Interrupt Level Assignment Chapter 6: Appendix 19
The
8254-2
timer/counter
is
treated
by
system
programs
as
an
arran-
gement
of
four
programmable
external
i/O
ports.
Three
are
treated
as
counters;
the
fourth
is
a
control
register
for
mode
programming.
System
Interrupt
Sixteen
levels
of
system
interrupts
are
provided
by
the
80386SX NMI
and
two
8259A
interrupt
controller
chips.
The
following
shows
the
interrupt-level
assignments’
decreasing
priority:
Table
6-4:
Interrupt
Level
Assignment
Chapter
6:
Appendix
19