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Pin No. Pin name
I/O
Description
66 EXTAL
0
System clock. (lOMHz)
67
XTAL I
System clock. (lOMHz)
68
Vee
-
Power supply.
69 AS
0
Not used.
70
RD 0
Lead signal output to digital meter (lC605), gate alley (lC606), master program ROM (lC607)
and master RAM (lC608, 609)
71
HWR
0
Upper rank byte light output to the digital meter (IC605), gate array (IC606), master RAM
(lC608,609).
72 LWR
0
Not used.
73
MDO
I
Operation mode select input. (Fixed
"H" level)
74
MDI I
Operation mode select input. (Fixed "H" level)
75 MD2 I
Operation mode select input. (Fixed
"L" level)
76 AVee
-
AID
converter power supply. (+5V)
77 VREF
I
Reference voltage input to
AID
converter.
78
ANO
I
Battery input terminal.
79
ANI I Error condition input from digital input IC (IC90l).
80
AN2 I FREQ REPORT 0 input from digital input IC (IC90l).
81
AN3 I FREQ REPORT 1 input from digital input IC (lC90l).
82 AN4
I
FREQ
REPORT 2 input from digital input IC (lC90l).
83 AN5
I
ERROR FLAG input from digital input IC (lC90l).
84
AN6 I
Padal switch 2 input terminal.
85 AN7 I
Padal switch 1 input terminal.
86 AVss
-
GND (AID converter)
87
IRQO
I
Interrupt request signal input from LCD controller (lC6l0).
88
P8I
0
Conditional jump output to DSP (lC602).
89
P82
0
Conditional jump output to DSP (lC604).
90
CSI
0
Address data output to gate alley (lC606).
91
CSO
0
Chip enable output to EEPROM (lC607).
92
Vss
-
GND
93
PAO
0
LCD data output.
94
PAl
0
LCD data output.
95
PA2
0 LCD data output.
96
PA3
0 Clock change signal output.
97
PA4
0
LCD data output.
98
PAS
0 Latch output to
0/
A converter.
99
PA6
0 MIDI THRU/OUT change signal output.
100
A20
0 Not used.
-
23-