CPU (LSI1: MSM6755C-17)

The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides the left and the right channels’ waveforms separately, by converting the data into the waveforms with two built-in DACs. The CPU also controls key and button input. The following table shows the pin functions of LSI1.

Pin No.

Terminal

In/Out

Function

 

 

 

 

1

MA14

Out

Address bus

 

 

 

 

2, 3

NCO

Not used

 

 

 

 

4 ~ 19

MA0 ~ MA13

Out

Address bus

 

 

 

 

13

MRDB

Out

Read enable signal

 

 

 

 

17

MCSB

Not used

 

 

 

 

20 ~ 27

MD0 ~ MD7

In/Out

Data bus

 

 

 

 

28, 29

NC1, NC2

Not used

 

 

 

 

30

DGND

In

Ground (0 V) source

 

 

 

 

31

DVCC

In

+5 V source

 

 

 

 

32, 33

XTLO, XTLI

In/Out

20 MHz clock input/output

 

 

 

 

34

NC3

Not used

 

 

 

 

35

RSTB

In

Reset signal input

 

 

 

 

36

P24/RXD

MIDI signal input

 

 

 

 

37

P25/TXD

MIDI signal output

 

 

 

 

38

NMI

In

Power ON signal input. Connected to +5 V.

 

 

 

 

39

APO

Out

APO (Auto Power Off) signal output

 

 

 

 

40

NC4

Not used

 

 

 

 

41

REFH

Out

Terminal for the internal DAC

 

 

 

 

42, 43

NC5, NC6

Not used

 

 

 

 

44

DAOR

Out

Sound waveform signal output

 

 

 

 

45

NC7

Not used

 

 

 

 

46

AVdac

In

+5 V source for the internal DAC

 

 

 

 

47

DAOL

Out

Left channel sound waveform output

 

 

 

 

48

REFL

Out

Terminal for the internal DAC and ADC

 

 

 

 

49

AGdac

In

Ground source for internal DAC

 

 

 

 

50

AGadc

In

Ground source for internal ADC

 

 

 

 

51

ANI

In

Not used

 

 

 

 

52

AVadc

In

+5 V source for the internal ADC

 

 

 

 

53

NC8

Not used

 

 

 

 

54

MOD0

In

Mode selection terminal. Connected to +5 V.

 

 

 

 

55, 56

MOD1, MOD2

In

Mode selection terminal. Connected to ground.

 

 

 

 

57

P40

Not used

 

 

 

 

58 ~ 64

KI0/P30 ~ KI7/P36

In

Terminals for key/button input signal

 

 

 

 

65

KI7/P37

Not used

 

 

 

 

66 ~ 73

KO0/P50 ~ KO7/P57

Out

Terminals for key scan signal

 

 

 

 

— 4 —

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Image 6
Casio casio electronic keyboard Nco, Mrdb, Mcsb, Dgnd, Dvcc, XTLO, Xtli, NC3, Rstb, P24/RXD, P25/TXD, Nmi, NC4, Refh, Daor

casio electronic keyboard specifications

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