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REV.-A
Table A-2. HD64180 Terminal Functions
Pin No.
Terminal
I/O
Description
Notes
32
Vcc
I
+5 VDC
1,33
Vss
-
GND
2
XTAL
I
External oscillator (12.2 MHz)
3
EXTAL
I
64
<P
0
Pulled up
7
RESET
I
Reset signal
13-31
AO-A 18
0
Address bus (19-bit, 512K-byte)
34-41
DO-D7
I/O
Data bus (8-bit)
63
RD
0
Read pulse
62
WR
0
Write pulse
59
ME
0
Memory enable
-
58
10E
0
Pulled up
4
WAIT
I
Pulled up
60
E
0
Enable (synchronous clock)
6
BUSREO
I
Pulled up
5
BUSACK
0
Pulled up
58
HALT
0
Pulled up
61
L1R
0
Pulled up
12
ST
0
Pulled up
-
57
REF
0
Refresh signal
- -
Pulled down
8
NMI
I
9
INTO
I
Pulled up
10
INn
I
Pulled up
- -
Interrupt 2
1 1
INT2
I
47
DREOO
I
Data request signal
54
DRE01
I
Pulled up
55
TEND1
0
Pulled up
45
TXAO
0
Pulled up
46
RXAO
I
Pulled up
42
RTSO
0
SCI channel 0 RTS
43
CTSO
I
SCI channel 0 CTS
44
DCDO
I
Pulled down
48
TXA1
0
SCI channel 1
49
RXA1
I
SCI channel 1
50
CKA1
110
Pulled up
51
TXS
0
CSO I/O TXD
52
RXS
I
CSO 110 RXD
53
CKS
110
CS I/O clock
A-4
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