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HT86A36 Arkusz danych(PDF) 43 Page - Holtek Semiconductor Inc

Numer części HT86A36
Szczegółowy opis  A/D Type Voice 8-Bit MCU
Download  68 Pages
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT86A36 Arkusz danych(HTML) 43 Page - Holtek Semiconductor Inc

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HT86Axx/HT86ARxx
Rev. 1.10
43
December 12, 2012
SP+/SP-
AMP_EN
tR
tR
For battery based applications, power consumption is a
key issue, therefore the amplifier should be turned off
when in the standby state. In order to eliminate any
speaker sound bursts while turning the amplifier on, the
application circuit, which will incorporate a capacitance
value of C1, should be adjusted in accordance with the
speaker s audio frequency response. A greater value of
C1 will improve the noise burst while turning on the am-
plifier. The recommended operation sequence is:
Turn On: audio signal standby (1/2VDD)
® enable am-
plifier
® wait tR for amplifier ready ® audio output
Turn Off: audio signal finished
® disable amplifier ®
wait tR for amplifier off
® audio signal off
If the application is not powered by batteries and there is
no problem with amplifier On/Off issues, a capacitor
value of 0.1
mF for C1 is recommended.
Analog to Digital Converter
The need to interface to real world analog signals is a
common requirement for many electronic systems.
However, to properly process these signals by a
microcontroller, they must first be converted into digital
signals by A/D converters. By integrating the A/D con-
version electronic circuitry into the microcontroller, the
need for external components is reduced significantly
with the corresponding follow-on benefits of lower costs
and reduced component space requirements.
A/D Overview
The devices contain a 4-channel analog to digital con-
verter which can directly interface to external analog sig-
nals, such as that from sensors or other control signals
and convert these signals directly into either a 12-bit dig-
ital value.
The following diagram shows the overall internal struc-
ture of the A/D converter, together with its associated
registers.
A/D Converter Data Registers
- ADRL, ADRH
The devices have a 12-bit A/D converter, two registers
are required, a high byte register, known as ADRH , and
a low byte register, known as ADRL. After the conver-
sion process takes place, these registers can be directly
read by the microcontroller to obtain the digitized con-
version value. They use two A/D Converter Data Regis-
ters, note that only the high byte register ADRH utilises
its full 8-bit contents. The low byte register ADRL uti-
lises only 4 of its 8-bit contents as it contains only the
lower 4 bit of the 12-bit converted value.
A D C S o u r c e
f O S C
¸ 2 ~
¸ 3 2
A C S R R e g i s t e r
A D C
V D D
A / D r e f e r e n c e v o l t a g e
A D R L
A D R H
A / D D a t a
R e g i s t e r s
P C R 0 ~ P C R 2
A C S 0 ~ A C S 1
S T A R T E O C
A D C R
R e g i s t e r
P i n C o n f i g u r a t i o n
B i t s
C h a n n e l S e l e c t
B i t s
S t a r t a n d E n d o f
C o n v e r s i o n B i t s
C l o c k D i v i d e R a t i o
P C 0 / A N 0
P C 1 / A N 1
P C 2 / A N 2
P C 3 / A N 3
A/D Converter Structure


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