— 8 —
DAC (UPD6376CX)
UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output
amplifier and zero offset circuit.
Key Touch LSI (HG52E35P)
By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key
touch LSI detects key velocity of 256-step. Then the LSI sends the CPU the note number and its velocity
data.
CRDB
CWRB
CKI
CCSB
RESB
CD0
CD7
CA0 ~ CA2
First contact
Second contact
KC0
KC7
FI0
FI7
SI0
SI7
Key input signal
Key scan signal
~
Data bus
Address bus
Key touch LSI
LSI106
HG52E35P
Keyboard
FI
SI
KC
RD
WR
APO
A12
A14
CLOCK
RESET
Pin No.
Terminal
In/Out
Function
1
SEL
In
Mode selection terminal. Connected to ground.
2
D.GND
In
Ground (0 V) source for internal digital circuit
3
NC
Not used
4
DVDD
In
+5 V source for internal digital circuit
5
A.GND
In
Ground (0 V) source for internal analog circuit
6
R.OUT
Out
Right channel sound waveform output
7
A.VDD
In
+5 V source for internal analog circuit
8
A.VDD
In
+5 V source for internal analog circuit
9
R.REF
In
Reference voltage terminal. Connected to a capacitor.
10
L.REF
In
Reference voltage terminal. Connected to a capacitor.
11
L.OUT
Out
Left channel sound waveform output
12
A.GND
In
Ground (0 V) source for internal analog circuit
13
LRCK
In
Word clock (L/R separation signal) input.
14
LRSEL
In
Not used. Connected to ground.
15
SI
In
Sound data input
16
CLK
In
Bit clock input
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