General Description

The Enhanced A/D MCUs are a series of 8-bit high performance, RISC architecture microcontrollers specifically designed for a wide range of applications. The usual Holtek microcontroller features of low power consumption, I/O flexibility, timer functions, oscillator options, power down and wake-up functions, watchdog timer and low voltage reset, combine to provide devices with a huge range of functional options while still maintaining a high level of cost effectiveness. In addition, these devices

Features

CPU Features

· Operating voltage:

fSYS = 4MHz: 2.2V~5.5V

fSYS = 8MHz: 3.3V~5.5V

fSYS = 12MHz: 4.5V~5.5V

· Up to 0.33ms instruction cycle with 12MHz system clock at VDD= 5V

· Oscillator types:

External high freuency Crystal -- HXT

External RC -- ERC

Internal RC -- HIRC

External low frequency crystal -- LXT

· Three operational modes: Normal, Slow, Sleep

· Fully integrated internal 4MHz, 8MHz and 12MHz oscillator requires no external components

· Watchdog Timer function

· LIRC oscillator function for watchdog timer

· All instructions executed in one or two instruction cycles

· Table read instructions

· 63 powerful instructions

· Up to 6-level subroutine nesting

· Bit manipulation instruction

· Low voltage reset function

· Wide range of available package types

Peripheral Features

· Up to 26 bidirectional I/O lines

· Up to 8 channel 12-bit ADC

· Up to 2 channel 8-bit PWM

· Software controlled 4-SCOM lines LCD driver with 1/2 bias

· External interrupt input shared with an I/O line

· Up to two 8-bit programmable Timer/Event Counter with overflow interrupt and prescaler

· Time-Base function

· Programmable Frequency Divider -- PFD

· 8x8 LED driving capability