HT36A4
Music Synthesizer 8-Bit MCU
Technical Document
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Features
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Operating voltage: 2.4V~5.0V
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Operating frequency: 3.58MHz~12MHz (typ. 8MHz)
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8 bidirectional I/O lines
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Two 8-bit programmable timer with 8 stage prescaler
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Watchdog Timer
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Built-in 8-bit MCU with 208´8 bits RAM
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Built-in 32K´16-bit ROM for program/data shared
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Mono output
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High D/A converter resolution: 16 bits
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Polyphonic up to 8 notes
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Independent volume mix can be assigned to each
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Sampling rate of 25kHz as 6.4MHz for system
frequency
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Eight-level subroutine nesting
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HALT function and wake-up feature to reduce power
consumption
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Bit manipulation instructions
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16-bit table read instructions
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63 powerful instructions
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All instructions in 1 or 2 machine cycles
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16-pin DIP/SOP package
sound component
General Description
The HT36A4 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 HT36A4 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.
Block Diagram
3 2 K
´
1 6 - b it
R O M
8 - B it
M C U
2 0 8
´
8
R A M
M u ltip lie r /P h a s e
G e n e ra l
1 6 - B it
D A C
P A 0 ~ P A 7
O S C 1
O S C 2
R E S
V D
V S
V D
V S
S
D
D A
S A
A U D
Rev. 1.10
1
March 12, 2007
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
