General Description The Enhanced I/O 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. 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 these devices, 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 • 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 • Software controlled 4-SCOM lines LCD driver with 1/2 bias • External interrupt input shared with an I/O line • Up to three 8-bit programmable Timer/Event Counter with overflow interrupt and prescaler • Time-Base function • Programmable Frequency Divider -- PFD
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