Panasonic KX-W50TH Service Manual page 18

(2) CPU Pin Function
CPU (HD6303X) is CMOS 8-bit single chip micro computer with 192 bytes of internal RAM . The pin functions
are as follows :
CLOCK OSC
X'TAL
4MHz0
E X'TAL
P2
PS
P6
A7
I
AO
7
6
5
4
3
2
1
0
07
I
DO
A15
I
A8
7
6
5
4
3
2
1
0
7
I
4
3
I
0
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¢
Address Bus (lower byte)
Interface (ACK) output
Buzzer output
Text LED ON output (KX-W60TH only)
Shift Lock LED ON output
Paper Out sensor output
Thermal Head ON output
Ribbon Select Switch output
Weak Batteries input
Data Bus
Q
Address Bus (upper byte)
}
. (TXD)
Interface mpu\oN Line)
Home Sensor input
Paper Out Sensor input
} Ribbon Select Switch input
Interface (STB) input
Return Key input
¢
Paper Feed Motor output
¢
Carriage Motor output
C
(~
,,,
...
( ~ ,..
\
(3) Gate Array Pin Function
Gate Array (PEVl1011ZA) is composed of the Address Decoder, the Buffer, the Inverter and the Data Latch (30
bits). The pin functions are as follows :
CORH
Hl24
H 1
LIDW
LIUP
RSET
EXSH
ISH
PASN
BATT
co
WR
E
HOME
BKUP
RAM1
RAM2
ROM
CPUR
P 20
P 22
P 54
P 55
olo
07
AO
A 1
A12
l
A15
KO 7
l
KO 0
Q 1
AKEY
LCDE
HEDW
HEUP
- Head Driver output (For Correct)
~ Head Driver output (For Print)
=:}
~ Correction Motor output
- Reset Signal input (For System)
- Head Protect Signal output
- Head Protect Signal input
- Paper Out Sensor input
- Battery input
- Correction Signal output
- WR Signal input (From CPU)
-- E Signal input (From CPU)
-- Home Sensor input (KX-WS0TH ONLY)
- Memory Back-Up output
- Chip Select output (For RAM)
- Chip Select output (For Expansion RAM) (KX-W60TH ONLY)
- Chip Select output (For ROM)
- Reset Signal output (For CPU)
- Weak Batteries output
- Thermal Head ON input
- Paper Out Sensor output
- Home Sensor output (KX-WS0TH ONLY)
Data Bus
Address Bus
Keyboard input
- 01 input
- Return Key input
- E Signal to LCD output
=}
Head Press Solenoid output
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