General Description
The HT46R005 and HT48R005 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.

CPU Features
Operating voltage:
   fSYS= 12MHz: 2.2V~5.5V
   fSYS= 16MHz: 3.0V~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
Two operational modes: Normal, Sleep
Fully integrated internal 4MHz, 8MHz and 12MHz oscillator requires no external components
OTP Program Memory: 0.5K14
RAM Data Memory: 328
Watchdog Timer function
LIRC oscillator function for watchdog timer
All instructions executed in one or two instruction cycles
Table read instructions
63 powerful instructions
2-level subroutine nesting
Bit manipulation instruction
Low voltage reset function
Wide range of available package types

Peripheral Features
6 bidirectional I/O lines
3 channel 12-bit ADC
External interrupt input shared with an I/O line
Single 8-bit programmable Timer/Event
Counter with overflow interrupt and prescaler
Buzzer driving pair supported
Package types: 10-pin MSOP