General Description
The HT48R01A is 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 cost effectiveness. Their fully integrated system oscillator, with three frequency selections, and being supplied in an extremely small outline MSOP 10-pin package 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
Operating voltage:
   fSYS= 4MHz: 2.2V~5.5V
   fSYS= 8MHz: 3.3V~5.5V
   fSYS= 12MHz: 4.5V~5.5V
7 bidirectional I/O lines and 1 input line
External interrupt input shared with an I/O line
Single 8-bit programmable Timer/Event Counter with overflow interrupt and 7-stage prescaler
External crystal system oscillator
Fully integrated internal RC oscillator available with three frequencies: 4MHz, 8MHz or 12MHz
Watchdog Timer function
Buzzer function
Power down and wake-up functions to reduce power consumption
Up to 0.33s instruction cycle with 12MHz system clock at VDD= 5V
4-level subroutine nesting
Bit manipulation instruction
Table read instructions
63 powerful instructions
All instructions executed in one or two machine cycles
Low voltage reset function
10-pin ultra-small MSOP package