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cPU (pPD78C11G)
CPU detects ths pressed keys and breath strenglh. The following is pin function of the LSl.
Pin No.
Terminal
lrVOut
Pin Function
3 - 1 0
PBO - PB7
l n
Inputs lrom keys and switches
1 1
PC0
Out
MlDl signal output
1 2
1 4
PC1 - PC3
Out
Scan signals for keys and switches
1 5
PC4
Out
The terminal outputs a High level pulse at Power
ON to prevent reverb noise.
1 6
PC5
Nol used
1 7
PC6
Out
Sound pitch signal output
1 8 - 2 1
PC7 - MODE1
Not used
22
RESET
l n
Power on reset terminal. When power sryitch is
turned on, the terminal receives a High level
signal for approximalely
I milll-seconds
in which
the internal ciranits of the LSI are initialized.
23
MODEO
Not used
_ 24,25
x2, x1
lr/Out
12 MHz clock pulse input and output
26
VSS
l n
Ground source for intemal digital circuits
27
AVSS
l n
Ground source for built-in ADC's (Analog to
Digital Converters)
2 8 - 3 5
ANO - AN7
I n
Input terminals of eight built-in ADC's which
convert the voltage inputs from Breath
Sensor Tuning pot, and Breath pot into
digital data.
ANO, ANl
Input from Breath Sensor block
AN2
AN3
Input from Tuning pot
Input from Breath pot
36
V R E F
l n
Reference voltage for built-in ADC
37
AVDD
l n
+5 V sourcs lor built-in ADC
3 8 - 4 4
R 0-
PF3
Not used
' . ;
:
'
r i . " ^ . ,
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