Casio GZ-500 manual DAC LSI104 UPD6376GS, KEY Controller LSI107 HG52E35P

DAC (LSI104: UPD6376GS)

The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms by each channel and output them separately.

The following table shows the pin functions of LSI1.

Pin No.	Terminal	In/Out		Function
1	SEL		In	Mode selection terminal. Connected to ground.
2	D.GND		In	Ground (0V) source for the internal digital circuit
3	NC			Not used.
4	DVDD		In	+5V source for the internal digital circuit
5	A.GND		In	Ground (0V) source for the right channel
6	R.OUT		Out	Right channel sound waveform output
7, 8	A.VDD		In	+5V source for the internal analog circuit
9	R.REF		In	Right channel reference voltage terminal
10	L.REF		In	Left channel reference voltage terminal
11	L.OUT		Out	Left channel sound waveform output
12	A.GND		In	Ground (0V) source for the left channel
13	LRCK		In	Word clock input
14	LRSEL		In	Not used. Connected to ground.
15	SI		In	Sound data input
16	CLK		In	Bit clock input

KEY CONTROLLER (LSI107: HG52E35P)

The key controller generates key scan signals and provides them to the keyboard. By counting the time between first-key input signal FI and second-key SI from the keyboard, the key controller detects key velocity. The note number and its velocity data are read at regular intervals by the CPU.

RD

APO

WR

CLOCK

A13

A14

RESET

Data bus

Address bus

Key Controller

LSI107

HG52E35P

CRDB

CWRB KC0 CKI

CCSB KC7

RESB FI0

CD0 SI0

CD7

FI7

CA0 ~ CA2 SI7

Key scan signal

Key input signal

Keyboard

KC

First contact

FI

SI

Second contact

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