Casio WK-1500 manual KEY Controller LSI16 HG52E35P

DAC (IC11: 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 IC11.

Pin No.	Terminal	In/Out	Function
1	SEL	In	Mode selection terminal. Connected to ground.
2	D.GND	In	Ground (0 V) source for the internal digit circuit
3	NC	—	Not used.
4	DVDD	In	+5 V source for the internal digital circuit
5	A.GND	In	Ground (0 V) source for the right channel
6	R.OUT	Out	Right channel sound waveform output
7, 8	A.VDD	In	+5 V 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 (0 V) 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 (LSI16: 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.

		Key Controller
	RDAB	LSI16
		HG52E35P
LSI17	WRAB	CRDB
			KC0
		CWRB
	CLKA
HG52E35P		CKI	~
	HGB
			KC7
		CCSB
	RESET	RESB	FI0
		CD0	SI0
Data bus
		~
		CD7	FI9
Address bus		CA0 ~ CA2 SI9

Key scan signal

Key input signal

Keyboard

KC

First contact

FI

SI

Second contact

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