Features

Operating voltage:
fSYS=4MHz: 2.2V~5.5V
fSYS=8MHz: 3.3V~5.5V

13 to 23 bidirectional I/O lines

External interrupt input shared with an I/O line

8-bit programmable Timer/Event Counter with overflow
interrupt and 7-stage prescaler

On-chip crystal and RC oscillator

Watchdog Timer function

PFD for audio frequency generation

Power down and wake-up functions to reduce power
consumption

Up to 0.5s instruction cycle with 8MHz system clock
at VDD=5V

4 or 6-level subroutine nesting

4 channels 8 or 9-bit resolution A/D converter

1 or 2 channel 8-bitPWMoutput shared with I/O lines

Bit manipulation instruction

Table read instructions

63 powerful instructions

All instructions executed in one or two machine
cycles

Low voltage reset function

Range of packaging types
General Description
The Cost-Effective A/D Type MCU DevICes are a 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 include an integrated
multi-channel Analog to Digital Converter in addition to
one or two Pulse Width Modulation outputs. The usual
Holtek MCU features such as power down and wake-up
functions, oscillator options, programmable frequency
divider, etc. combine to ensure user applications require
a minimum of external components.
The benefits of integrated A/D and PWM functions, in
addition to low power consumption, high performance,
I/O flexibility and low-cost, provide these devices with
the versatility to suit a wide range of application possibilities
such as sensor signal processing, motor driving, industrial
control, consumer products, subsystem
controllers, etc. Many features are common to all devices,
however, they differ in areas such as I/O pin
count, Program Memory capacity, A/D resolution, stack
capacity and package types.