General Description

The Enhanced I/O MCU devices are a series of 8-bit high performance, RISC architecture microcontroller 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. The fully integrated system oscillator HIRC, which requires no external components and which has three frequency selections, opens up a huge range of new application possibilities for the device, some of which may include industrial control, consumer products, household appliances subsystem controllers, etc.

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 0.33μs 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

? Four operational modes: Normal, Slow, Idle, 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

? Program Memory: 1K x 14 ~ 4K x 15

? Data Memory: 64 x 8 ~ 224 x 8

? Up to 42 bidirectional I/O lines

? 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

? Two integrated operational amplifiers with interrupt function - one with programmable gain control

? Single comparator with interrupt and low power consumption