Casio CPS-85 User Manual download pdf (Page 6)

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NOMENCLATURE OF KEYS

POWER SUPPLY CIRCUIT

The power supply circuit generates five voltages as shown in the following table. VDD voltage is always

generated. The others are controlled by POWER signal from the CPU.

RESET CIRCUIT

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The

CPU then initializes its internal circuit, and clears the working storage RAM.

When the power switch is pressed, the CPU receives a low level signal. The CPU sends POWER signal

to the power supply circuit, also sends a reset signal to the DSP.

When the keyboard is powered by batteries and no operation is made for six minutes, CPU drops signal

POWER to shut all the voltage except VDD off.

C#2 D#2 F#2 G#2A#2 C#3 D#3 F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 C#6 D#6 F#6 G#6 A#6 C#7 D#7 F#7 G#7 A#7

D2 E2 F2 G2 A2 B2C1 D1 E1 F1 G1 A1 B1A0 B0 C3 D3 E3 F3 G3 A3 B3

C#1 D#1 F#1G#1A#1

A#0

C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 D6 E6 F6 G6 A6 B6C6 C7 D7 E7 F7 G7 A7 B7 C8

Reset IC

IC1

RN5VD35AA

DSP

LSI1

HG51B277FB

VDD

Reset signal

To power supply circuit

VDD

Battery set

RESET

VDD

Power switch

NMI

POWER

PLE

CPU

LSI4

GT913F

SCKO

emaNegatloVfonoitareporoF

DDVV5+ MARtceffE,MARegarotsgnikroW,MORecruosdnuoS,PSD,CIteseR,UPC

DDVAV5+skcajnieniL,CAD

DDVLV5+pmaltoliP

CCVV9+reifilpmarewoP,skcajtuoeniL

CCVAV9+.pmAerP

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

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Casio CPS-85 User Manual Page 6

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