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