Holtek HT46R22, Handbook

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C h a p t e r 1
Hardware Structure
This section is the main datasheet section of the A/D Type microcontroller handbook and contains
all the parameters and information related to the hardware. The information contained provides de-
signers with details on all the main hardware features of the A/D Type microcontroller range which
together with the programming section contains the information to enable swift and successful im-
plementation of user microcontroller applications. By proper consultation of the relevant parts of
this section, users can ensure that they make the most efficient use of the flexible and
multi-function features within the A/D Type microcontroller series.
Introduction
The HT46R47/HT46C47, HT46R22/HT46C22, HT46R23/HT46C23 and HT46R24/HT46C24
form the series of 8-bit high performance RISC architecture microcontrollers, designed especially
for applications that interface directly to analog signals, such as those from sensors. All devices in-
clude an integrated multi-channel Analog to Digital Converter in addition to one or more Pulse
Width Modulation outputs. Device flexibility is enhanced with the usual features of the other
microcontroller range such as HALT and wake-up functions, oscillator options, programmable fre-
quency divider etc. These features combine to ensure applications require a minimum of external
components and therefore reduce overall product costs. Having the benefits of integrated A/D and
PWM functions, in addition to the advantages of low power consumption, high performance, I/O
flexibility, as well as low cost, these devices have the versatility to suit a wide range of application
possibilities such as sensor signal processing, motor driving, industrial control, consumer prod-
ucts, subsystem controllers, etc. Many features are common to all devices however, they differ in
areas such as I/O pin count, RAM and ROM capacity, timer number and size, A/D channels, PWM
outputs, etc.
The HT46R47, HT46R22, HT46R23 and HT46R24 are OTP devices offering the advantages of
easy and effective program updates, using the Holtek range of development and programming
tools. These devices provide the designer with the means for fast and low cost product develop-
ment cycles. However, for applications that are at a mature state in their design process, the
HT46C47, HT46C22, HT46C23 and HT46C24 mask version devices offer a complementary de-
vice for products with high volume and low cost demands. Fully pin and functionally compatible
with their OTP sister devices, such mask version devices provide the ideal substitute for products
which have gone beyond their development cycle and are facing cost down demands.
Chapter 1 Hardware Structure
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