— 13 —
VDD
RESET
CPU
LSI104
HD6433298A42F
Reset IC
IC104
RH5VL36A
Working Storage RAM
LSI106
LC3564SM-85
DSP
LSI103
HG51B155FD-1
VDD
DVDD
VDD
-RESET
POWER
From power switch
-NMI
To power supply circuit
Power ON signal
P42
Pin No.
Terminal
In/Out
Function
1
SEL
In
Mode selection terminal. Connected to ground.
2
D.GND
In
Ground (0V) source for the internal digital circuit
3
NC
Not used.
4
DVDD
In
+5V source for the internal digital circuit
5
A.GND
In
Ground (0V) source for the right channel
6
R.OUT
Out
Right channel sound waveform output
7, 8
A.VDD
In
+5V 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 (0V) 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
Name
Voltage
For operation of
VDD
+5 V
CPU, Reset IC, Working strage RAM
DVDD
+5 V
DSP, Effect RAM, DAC, Pilot lamp
AVDD
+5V
DAC, Filter
AVCC
+7 V
Headphone amplifier, Line ount amplifier
VCC
+8 V
Mute circuit
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 the power ON signal output from the CPU.
RESET CIRCUIT
When 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 pulse of POWER signal. The CPU provides
the power ON signal to the power supply circuit and raises RESET signal to +5V to reset the DSP.
Summary of Contents for GZ-50M
Page 18: ...18 EXPLODED VIEW 3 1 2 5 4 6...
Page 21: ...MA0700951A...
