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5.2.2 CPU
The KX-W1500 is a microprocessor controlled word processor. It is built around the 8bit HD63BO03X CPU "Central
Processing Unit" (C18), which has full control over all machine functions. It controls the printer. mechanism, the
display, and memory management. The pin names and functions are shown in the following chart.
NAME
FUNCTION
|
.
NAME
FUNCTION
Vss
GND
E
System Clock (1.75MHz)
XTAL
RESONATOR Input
RD
— _ — ' |
READ Signal
EXTAL
(7MHz)
3
62
WR
WRITE Signal
MPO
CPU Mode Select
| 61 |
RW
READ/WRITE
MP1
CPU Mode Select
60
LIR
Load Instruction
RES
Reset
| 6 |
BA
Bus Available
|
STBY —_| Stand by Signal
Do
NMI
Interrupt Signal -
| 8 |
D1
P20
.
9 |
D2
a9
ee
=
eae
Spacing Motor
7
vi
Data Bus
ae
pees Signal
—-
P24
Carrier Spacing Enable
D6
P25
Carrier Return Control
14
D7
P26
BUZZER
oa.
it -~.§
P27
7 Hz
~ |
At
|
IRQ 4
Interrupt Signal
|
A200
P51
_ | Display Timing
A3
a
-——————_
Address Bus
MR(P52)
MEMORY Request
19
A4
P53
HALT
AS
P54
Paper Feed Sensor & Carrier Sensor
A6
P55
N.C
;
AT
P56
Keyboard
Vss
GND
P57
Data
AB
P60
ii
AQ
Be
Daisywheel
rae
P62
ea
Att
Bee
Phase Signal
ae
Address Bus
P64
Paper Feed Motor
A13
P65
and Ribbon Feed Motor
A1l4
P66
Control Signals
A15
P67
Ribbon Feed Sensor
Vcc
+5V
OR x:
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