PC-1600
47
GND
Power
supply.
48
A8
Out
Address
bus (see Pin No.39l.
49
VGG
Power
supply.
.
50-56
A9-A15
Out
Address
bus (see Pin No.39).
57
(NC)
-
58
R/W
Out
Memory
write signal. With a low R/W state,
the data in the CPU are sent on the data
bus.
59
Pep
Out
External
latch clock.
With a high state
of this clock,
the contents
of the accumulator
are
transferred
onto the data bus. Use of the latch
IC permits
its use as the outout
port
(see
the ATP command).
_.-
I
60
PV
Out
These are the CPU internal
flip·flop
output
pins (PU, PV).
61
PU
Out
There
are commands
to set and reset PU and PV.
62
epOS
Out
The clock,
in the same phase as the CPU internal
basic clock,
is on this line to supply
clock pu Ise to the external
system.
When a 2.6MHz
crvstal. is connected
ac ross X LO and XL 1, a 1.3 MHz clock
is supplied.
63
XLO
In
Crvstal
connection
pins. XLO is an input
and XL1 is an output,
64
XL1
Out
Inside the CPU, the clock
is divided
in half. When a 2.6MHz
crystal
is connected,
the
machine
cycle within
the CPU is at 1.3MHz.
65
WAIT
In
CPU wait signal. When this input
is high, the CPU's internaioperation
clock
"ep"
stops
and the CPU therefore
stops executing
a command.
When it resumes
a low state,
the
CPU starts
to execute
a command.
Internal
basic clock
.pOS
CPU operating
clock
ep
I
WAIT input
I
CPU internal
I
\
flip-flop
WA
NOTE:
WA is the CPU internal
flip-flop
for WAIT. At a high to low transition
of the clock
I
epOS, input
of WAIT is accepted.
The CPU operating
clock
ep
stops when
WA is at high; the CPU halts a command
execution
temporarily
as a resu It.
66-73
IN7-INO
In
Input
port.
The CPU can send the signal input
on the INO-I N7 to the CPU accumulator
as an 8·bit
data.
It has an internal
pull-up
resistor.
When not connected,
the CPU assumes
the line to
be in high impedance.
74-76
(NC)
-
NOTE:
NC: No Connection
-26-
Summary of Contents for PC-1600
Page 42: ... 11 CIRCUIT DIAGRAM PARTS POSITION KEY P W B LCD SIDE 39 ...
Page 43: ...PC l600 40 ...
Page 44: ...PC 1000 KEY P W B LSI SIDE 41 ...
Page 45: ... 42 ...
Page 48: ... PC l600 F P C P W B 45 ...
Page 49: ... Kn 46 ...
Page 52: ... PC l600 CONNECTOR P W B 49 ...
Page 53: ... 50 ...
Page 55: ... __ PC l600 tli I ONLY Pc 1600K I I 1 I 52 l J ...
Page 56: ... PC l600 K MEMORY P W B ROM Cut c IJ O lJ1F C O lJ1F I Bend capacitor to inward ROM SIDE 53 ...
Page 57: ...RAM SIDE 54 ...
Page 61: ...I I 2 3 4 42 58 ...
Page 93: ... P W B LSI SIDE t 90 ...
Page 117: ... PC I600 ...
