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MCU (87C58UBA)
The MCU controls all key and button output, sound output, LCD display. It read data from the external ROM
when a drum pad is hit and the selected tone; the MCU can read rhythm data simultaneously when a rhythm
pattern is selected. Then it convert the data into MIDI message and send to the sound engine for sound output.
The following table shows the pin function of the LSI.
Pin. No.
Terminal
1
NC
PAD4_HIT~
2~5
PAD1_HIT
6~9
KI0~KI3
10
#RST
11
LCD-CK
12
NC
13
MIDI-OUT
14
N.U.
15
SE-LE
16
VOL-CK
17
DATA
18
CLK
19
DA-ML
20, 21
XTAL1, XTAL2
22
VSS
23
NC
24
RESET
25
N.U.
26
PWR-WRN
27
MOE
28
LEL
29
LEH
30
CTR-LE0
31
CTR-LE1
32
#PSEN
33
ALE
34
NC
35
#EA/VPP
36~43
P0.7~P0.0
44
VCC
In/Out
---
Not used. No Connection.
In
Input Terminals for Piezzo electric sensor.
In
Terminals for key scan signal.
In
Reset signal input.
Out
Clock for LCD Driver chip
---
Not used. No Connection.
Out
MIDI message output terminal
---
Not used.
Out
Sound Effect LE signal output terminal.
Out
Clock for Electronic Volume Control chip
Data bus for SE chip, DAC and Electronic volume control
Out
chip.
Clock output for SE chip, DAC and Electronic volume
Out
control chip.
Out
Signal ML for DAC
---
Connected to 12.0MHz crystal
In
Ground (0V) source
---
Not used. No Connection.
Out
Reset signal output
---
Not used.
In
Power Warning signal Input Terminal
Out
OE signal for MIDI data ROM
Out
Latch output for the low byte address
Out
Latch output for the high byte address
Out
Latch output for the low byte address
Out
Latch output for the high byte address
Out
Program Store Enable
Out
Address Latch Enable
---
Not used. No Connection.
In
Extenal Access Enable
In/Out
Data I/O
In
+5V source
— 6 —
Function
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