HMCS404AC------------------------------------------------------------------------
Table 15. TIMER-B Interrupt Request Flag
TIMER-B Interrupt
Request Flag
o
Interrupt Request
No
Yes
Table 16. TIMER-B Interrupt
Mask
TIMER-B Interrupt
Mask
o
• INPUT/OUTPUT
Interrupt Request
Enable
Disable (Mask)
The
MeV
provides 58
Input/Output
pins, and they are con-
sist
of
32 standard pins and 26 high voltage pins. Each standard
pin may have one
of
three mask options: (A) "Without pull-
up
MOS
(NMOS open drain)", (B) "With pull-up MOS", or
(C) "CMOS". And also each high voltage pin may have one
of
two mask options: (D) "Without pull-down
MOS
(PMOS
Pull
up
MOS
(e)
approximately 40k.o.
to
160k.o.
Vee
Vee
PMOS(B)
approximately
1
k.o.
NMOS(A)
approximately
250.0.
open drain)",
or
(E) "With pull-down MOS". As pull-down
MOS
is
connected
to
internal V disp line, select
RAI
IV di;p pin
as V disp with mask
option
when at least
one
high voltage pin
is
selected
as
"With pull-down MOS" option.
When any
Input/Output
common pin
is
used as
input
pin,
it
is
necessary
to
select
the
mask
option
and
output
data as shown
in Table 18.
•
Output
Circuit Operation
of
Standard Pins with "With pull-
-up
MOS" Option
Fig.
15
shows the circuit used
in
the standard pins with
"with
pull-up MOS"option.
By
execution
of
the
output
instruction, the write pulse will
be generated, and
be
applied
to
the addressed port. This pulse
will turn
"ON"
the
PMOS
(B)
to
make the transient time
shorten
to
obtain "High level",
if
the
output
data
is
changed
from
"0"
to
"I".
In this case, the "write pulse" allows the
PMOS
(B)
to
turn
"ON"
as long
as
1/8 instruction cycle. While
"write pulse"
is
"0",
pull-up
MOS
(C) may retain the
output
in
high level.
The HLT signal becomes
"0"
in stop mode, so
that
MOS
(A)
(B) (C) turn
"OFF".
Write pulse
(Output
,..-4-
_______
instruction)
~--~------~----
HLT
Data
1
Instruction
cycle
Output
instruction
execution
Write pulse
___
----'nl---
__
Fig.
15
Output
Circuit Operation of Standard Pins with "with Pull-up MOS" Option
318
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