Casio GZ-5 manual Circuit Description, Key Matrix, CPU LSI101 MSM6387-A23, KO10

CIRCUIT DESCRIPTION

Key Matrix

	KI0	KI1	KI2	KI3	KI4	KI5	KI6	KI7
KO0	F3	F#3	G3	G#3	A3	A#3	B3	C4
KO1	C#4	D4	D#4	E4	F4	F#4	G4	G#4
KO2	A4	A#4	B4	C5	C#5	D5	D#5	E5
KO3	F5	F#5	G5	G#5	A5	A#5	B5	C6
KO4				Pad 0	Pad 1	Pad 2	Pad 3	Pad 4
KO5			Enter	Pad 5	Pad 6	Pad 7	Pad 8	Pad 9
KO6				Volume	Volume	Bend	MIDI CH.	Control
				Up	Down	Sense
KO7	Pitch							Pitch
	Bend -							Bend +
KO8								Modula-
								tion
KO9			Velocity	Velocity	Velocity	Velocity	Velocity	Velocity
			ff	f	mf	mp	p	pp
KO10	Internal	MIDI Out	Octave	Octave	Octave	Octave	Octave	Octave
			Shift C6	Shift C5	Shift C4	Shift C3	Shift C2	Shift C1

CPU (LSI101: MSM6387-A23)

Containing a MIDI controller, the CPU outputs MIDI messages in accordance with the pressed keys and buttons.

The following table shows the pin functions of LSI101.

Pin No.	Terminal	In/ Out		Function
1, 2	TEST1, TEST2			Not used. Connected to ground.
3	RESET		In	Power ON reset input. On: +6V Off: 0V
4	AVDD		In	+5 V sorce for the built-in DAC
5	OUT		Out	Sound waveform output
6	AGND		In	Ground (0 V) source for the built-in DAC
7	GND		In	Ground (0 V) source
8	COSI		In	21.725 MHz clock pulse input
9	COSO			Not used.
10	VDD		In	+5 V source
11 ~ 18	KI0 ~ KI7		In	Input terminal from keys and switches
19	KO11		Out	MIDI signal output
20 ~ 30	KO10 ~ KO0		Out	Key and switch scan signal output

— 9 —