Rev. 1.00
1
June 30, 2003
HT36A3
8-Bit Music Synthesizer MCU
Block Diagram
Features
Operating voltage: 2.4V~5.0V
Operating frequency: 3.58MHz~12MHz (typ. 8MHz)
20 bidirectional I/O lines
Two 8-bit programmable timer with 8 stage prescaler
Watchdog Timer
Built-in 8-bit MCU with 208
8 bits RAM
Built-in 32K
16-bit ROM for program/data shared
Mono output
High D/A converter resolution: 16 bits
Polyphonic up to 8 notes
Independent pan and volume mix can be assigned to
each sound component
Sampling rate of 25kHz as 6.4MHz for system
frequency
Eight-level subroutine nesting
HALT function and wake-up feature to reduce power
consumption
Bit manipulation instructions
16-bit table read instructions
63 powerful instructions
All instructions in 1 or 2 machine cycles
28-pin SOP, 48-pin SSOP package
General Description
The HT36A3 is an 8-bit high performance RISC-like
microcontroller specifically designed for music applica-
tions. It provides an 8-bit MCU and a 8 channel
wavetable synthesizer. The program ROM is composed
of both program control codes and wavetable voice
codes, and can be easily programmed.
The HT36A3 has a built-in 8-bit microprocessor which
programs the synthesizer to generate the melody by
setting the special register from 20H~2AH. A HALT fea-
ture is provided to reduce power consumption.
8 - B i t
M C U
M u l t i p l i e r / P h a s e
G e n e r a l
1 6 - B i t
D A C
O S C 1
O S C 2
R E S
V D D
V S S
V D D A
V S S A
A U D
2 0 8 8
R A M
3 2 K 1 6 - b i t
R O M
P A 0 ~ P A 7
P B 0 ~ P B 7
P C 0 ~ P C 3
Pin Assignment
Pad Assignment
Chip size: 83
111 (mil)
2
* The IC substrate should be connected to VSS in the PCB layout artwork.
HT36A3
Rev. 1.00
2
June 30, 2003
H T 3 6 A 3
4 8 S S O P - A
P A 3
P A 2
P A 1
P A 0
P C 3
P C 2
P C 1
P C 0
N C
N C
N C
N C
N C
N C
O S C 2
O S C 1
N C
N C
R E S
N C
N C
N C
A U D
T E S T
P A 4
P A 5
P A 6
P A 7
P B 0
P B 1
P B 2
P B 3
P B 4
P B 5
P B 6
P B 7
N C
N C
V S S
V S S A
V D D
V D D A
N C
N C
N C
N C
N C
N C
4 8
4 7
4 6
4 5
4 4
4 3
4 2
4 1
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
H T 3 6 A 3
2 8 S O P - A
P A 4
P A 5
P A 6
P A 7
N C
N C
N C
V S S
V S S A
V D D
V D D A
N C
T E S T
A U D
P A 3
P A 2
P A 1
P A 0
N C
N C
O S C 2
N C
O S C 1
N C
R E S
N C
N C
N C
O S C 1
O S C 2
R E S
V S S
V D D
P B 4
P B 5
P B 6
1
2
3
4
5
6
7
8
9
2 9
2 8 2 7
2 6 2 5
2 4 2 3 2 2 2 1 2 0 1 9
1 8 1 7
1 6 1 5 1 4
( 0 , 0 )
1 0
1 1
1 2
1 3
P B 7
V S S A
V D D A
A
U
D
T
E
S
T
P
C
0
P
C
1
P
C
2
P
C
3
P
A
0
P
A
1
P
A
2
P
A
3
P
A
4
P
A
5
P
A
6
P
A
7
P
B
0
P
B
1
P
B
2
P
B
3
Pad Coordinates
Pad No.
X
Y
Pad No.
X
Y
1
-879.100
1202.400
16
693.900
1240.150
2
-879.100
1097.100
17
583.300
1240.150
3
-879.100
986.500
18
483.300
1240.150
4
-879.100
886.500
19
372.700
1240.150
5
-898.600
-805.050
20
272.700
1240.150
6
-898.600
-931.910
21
162.100
1240.150
7
-847.650
-1041.910
22
62.100
1240.150
8
-847.650
-1180.350
23
-48.500
1240.150
9
-193.090
-1200.600
24
-148.500
1240.150
10
-81.290
-1200.600
25
-259.100
1240.150
11
875.950
-1262.274
26
-359.100
1240.150
12
875.950
-1149.626
27
-469.700
1240.150
13
875.950
-471.774
28
-569.700
1240.150
14
901.500
1240.150
29
-680.300
1240.150
15
793.900
1240.150
Pad Description
Pad Name
I/O
Internal
Connection
Function
PA0~PA7
I/O
Pull-High
or None
Bidirectional 8-bit Input/Output port
PB0~PB7
I/O
Pull-High
or None
Bidirectional 8-bit Input/Output port
PC0~PC3
I/O
Pull-High
or None
Bidirectional 8-bit Input/Output port
VSS
Negative power supply, ground
VSSA
Negative power supply of DAC, ground
VDD
Digital power supply
VDDA
DAC power supply
AUD
O
Audio output
TEST
No connection (open)
RES
I
Reset input, active low (no pull-high)
OSC1
OSC2
I
O
OSC1 and OSC2 are connected to an RC network or a crystal (by mask op-
tion) for the internal system clock. In the case of RC operation, OSC2 is the
output terminal for 1/8 system clock. The system clock may come from the
crystal, the two pins cannot be floating.
HT36A3
Rev. 1.00
3
June 30, 2003
Absolute Maximum Ratings
Supply Voltage .............................V
SS
-0.3V to V
SS
+6V
Storage Temperature ...........................
-50C to 125C
Input Voltage .............................V
SS
-0
.
3V to V
DD
+0.3V
Operating Temperature ..........................
-25C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under
Absolute Maximum Ratings may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
D.C. Characteristics
Ta=25
C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
2.2
4.5
5.5
V
I
DD
Operating Current
4.5V
No load, f
OSC
=8MHz
8
16
mA
I
STB
Standby Current (WDT Disabled)
4.5V
No load, System HALT
1
3
mA
I
OH
I/O Ports Source Current
4.5V
V
OH
=4.5V
2
3
mA
I
OL
I/O Ports Sink Current
4.5V
V
OL
=0.5V
2
3
mA
V
IH
Input High Voltage for I/O Ports
4.5V
0.8V
DD
V
DD
V
V
IL
Input Low Voltage for I/O Ports
4.5V
0
0.2V
DD
V
HT36A3
Rev. 1.00
4
June 30, 2003
Application Circuit
HT36A3
Rev. 1.00
5
June 30, 2003
H T 3 6 A 3
V
D D
1 0 0 k W
0 . 1 m F
P C 0 ~ P C 3
P A 0 ~ P A 7
P B 0 ~ P B 7
O S C 1
O S C 2
8 M H z
R E S
V
D D
V
D D
S P K
8 W
1 k W
1 0 0 k W
0 . 1 m F
7 5 0 W
V S S A
V S S
P C 0 ~ P C 3
P A 0 ~ P A 7
P B 0 ~ P B 7
H T 3 6 A 3
A U D
O S C 1
R E S
V
D D
V D D
V D D A
1 0 W
4 7 m F
0 . 1 m F
V
D D
V D D
V D D A
1 0 W
4 7 m F
0 . 1 m F
A U D
V
D D
4 7 m F
0 . 1 m F
V r e f
1 0 m F
I N
V D D
H T 8 2 V 7 3 3
V S S
C E
O U T N
O U T P
S P K
8 W
2 0 k W
1
2
3
4
5
7
8
V S S A
V S S
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