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Pin No.
Port Name
I/O
78
AN0
I
79~83
AN1~AN5
I
84
DA0
O
85
NC
O
86
AVSS
I
87
EN
I
88
_CS3
O
89
_CS2
O
90
_CS1
O
91
NC
O
92
VSS6
I
93
RD/_BY
I
94
PA1
O
95~98
ATT1~ATT4
O
99
AFM
O
100
A20
O
Reset IC : S-80930CNNBG80 (IC1)
■ Block Diagram
VDD
+
*
–
VSS
* : Parastic diode
Analog Switch : TC7W66FK (IC53, IC54)
■ Block Diagram
IN/OUT1
1
OUT/IN1
2
CONT2
3
GND
4
■ Truth Value Table
CONTROL
SWITCH FUNCTION
H
ON
L
OFF
SEMICONDUCTOR DATA
Function
A/D conversion (Voice input)
Not used
D/A conversion (Voice output)
Not used
GND
Enable input/Power save relese interruption
Chip select output (IC5)
Chip select output (IC3)
Chip select output (SRAM)
Not used
GND
Flash memory busy input
Beat shift control
Voice output attenuation control
Voice output mute control
Address bus
OUT
*
Delay
circuit
*
CD
8
VCC
7
CONT1
6
OUT/IN2
5
IN/OUT2
Pull Down
Analog GND
Lo : Enable
Lo : Chip select
Lo : Chip select
Lo : Chip select
Lo : BUSY (Erasing / Writing), ← IC3 · IC5
Hi : ON
Hi : ON
Hi : ON
→ IC3 · IC5
Bus Switch with Level Shifting
: TC7MBD3244AFK (IC57)
■ System Figure
1A1
(2A1)
1A4
(2A4)
1OE
(2OE)
■ Truth Value Table
Input
Function
OE
L
A port = B port
H
Disconnect
VGS-1
Remarks
1B1
(2B1)
1B4
(2B4)
5
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