Lsi Pin Description - Casio QT-2000 Service Manual

5-4. LSI pin description

1. CPU (uPD70108HGC-16-3B6)
Pin No. Name
1 A18/PS2
2 A17/PS1
3 A16/PS0
4 A15
5 VDD
6 VDD
7 GND
8 GND
9 IC
10 A14
11 A13
12 A12
13 A11
14 NC
15 A10
16 A9
17 A8
18 AD7
19 AD6
20 AD5
21 AD4
22 AD3
23 AD2
24 AD1
25 AD0
26 NC
27 NC
28 NMI
29 INT
30 CLK
31 GND
32 NC
33 GND
34 GND
35 RESET
36 READY
37 _POLL
38 _INTAK
39 ASTB
40 NC
41 _BUFEN
42 BUF_R/W
43 IO/_M
44 _WR
45 HLDAK
46 NC
47 HLDRQ
48 _RD
49 S/_LG
50 LBS0
51 A19/PS3
52 NC
Description
Address bus (A18) / Processor status
Address bus (A17) / Processor status
Address bus (A16) / Processor status
Address bus (A15)
Power source
Power source
GND
GND
Internaly connect (GND)
Address bus (A14)
Address bus (A13)
Address bus (A12)
Address bus (A11)
Not used
Address bus (A10)
Address bus (A9)
Address bus (A8)
Address / Data bus (AD7)
Address / Data bus (AD6)
Address / Data bus (AD5)
Address / Data bus (AD4)
Address / Data bus (AD3)
Address / Data bus (AD2)
Address / Data bus (AD1)
Address / Data bus (AD0)
Not used
Not used
Non-maskable interrupt (GND)
Maskable interrupt
System clock (16MHz)
GND
Not used
GND
GND
Reset
Ready signal
Polling signal
Interrupt acknowedge
Address strobe
Not used
Buffer enable
Buffer read/write enable
IO / memory select signal
Write strobe
Hold acknowlege
Not used
Hold request
Read strobe
Small / Large select (5V)
Not used
Address bus (A19) / Processor status
Not used
— 21 —
I n / O u t
Out
Out
Out
Out
-
-
-
-
-
Out
Out
Out
Out
-
Out
Out
Out
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
-
-
-
In
In
-
-
-
-
In
In
In
Out
Out
-
Out
Out
Out
Out
Out
-
In
Out
-
-
Out
-