General Description
The Small Package 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 inte
grated 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: 3.0V~5.5V
   fSYS= 12MHz: 4.5V~5.5V
Up to 0.33s instruction cycle with 12MHz system clock at VDD= 5V
Sleep mode and wake-up functions to reduce power consumption
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
OTP Program Memory: 1K15 ~ 2K15
RAM Data Memory: 968
Watchdog Timer function