REV.-A
ROM#1
oL
~
ROM
select _
ROM#2
v
{(
I
,
,
I
,
v
,
,
v
MSB
II
DAO
~
7
Fig.
2-99
ROM
data is read by a read
at
I/O address
0023H
from the
6303.
2.10.2
Power
control
Data
register
11\
~
,
~
LSB
..
6303
v
(
Read)
ddress
023H
A
0
Address
0023H
Address
0022H
6303
The
+5V
ROM
power
supply is controlled via, the
6303,
by
accessing the command register in
GAH40S. The process is similar
to
the
ROM
data read. The SWPR signal,
which
turns the
power
supply on and off, corresponds
to
bit 0
of
the command register (I/O address
0021
H),
which
is
under the direct control
of
the
6303.
GAH40S
I
~
I
Data
~---
....
q
ROM 1
I
ROM2
-V
I
Slave
I
CPU
----~
t
6303
Address 0021 H
+5V
regulator
SWPR
ROM
capsule
power supply
Fig.
2-100
2-97
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