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