3.1.1
1
lnterrupt Functions
The
PC-8201
is equipped with a 4-priority level interrupt control logic.
The interrupts are
input to
the
80C85
(TRAP, RST
7.5. 6.5, 5.5).
TRAP is nonmaskable; rlie others can be
masked by software control.
POWER TRAP
KEY
INT
Function
POWER
TRAP
KEY
INT
UART
BCR
Priority
High
Low
Power voltage is low.
If
it becomes less than
a certain value. the interrupt is enabled and
power automatically turns off.
Interrupt Channel
TRAP
RST 7.5
RST
6.5
RST 5.5
Searches the input key by the
256
kHz
clock
which is transmitted from the timer chip.
pPD
1990AC.
UART
Received interrupt from UART
IM6402
BCR
Interrupt from bar code reader
All interrupts except TRAP have an exclusive use mask flag, so each can be individually
masked.
The mask flag is set or reset
by
the SIhl (Set Interrupt
h4ask)
command.
See the command of
80C85.
432
1
0
ACC
R7.5 MSE M7.5
M6.5 M5.5
To Next Page
Loading...
