The HT68R2420 device is an OTP Memory type 8-bit high performance RISC architecture microcontroller, designed for IR remote controllers and IR transmission related products.

For memory features, the device includes an OTP Program Memory and an area of RAM Data Memory. Protective features such as an internal Watchdog Timer and Low Voltage Reset coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

A full choice of internal high and low speed oscillators are provided and the two fully integrated system oscillators require no external components for their implementation. The ability to operate and switch dynamically between a range of operating modes using different clock sources gives users the ability to optimize microcontroller operation and minimize power consumption.

The device includes a 9-bit timer for IR carrier output and a Time-base function which can generate fixed time interrupt. The inclusion of flexible I/O programming features, high driving current capacity with many other features ensure that the device will find excellent use in IR remote controller and timer applications which require a high accuracy clock, a timing function or a high driving current.

CPU Features

• Operating voltage: fSYS =4MHz: 2.0V~5.5V
• Up to 1μs instruction cycle with 4MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Oscillator types
  • Internal High Speed 4MHz RC – HIRC
  • Internal Low Speed 32kHz RC – LIRC
• Multi-mode operation: FAST, SLOW, IDLE and SLEEP
• Fully integrated internal oscillators require no external components
• All instructions executed in one or two instruction cycles
• Table read instructions
• 61 powerful instructions
• 2-level subroutine nesting
• Bit manipulation instruction

Peripheral Features

• OTP Program Memory: (1K-16)×14
• Data Memory: 32×8
• Watchdog Timer function
• 16 bidirectional I/O lines
• One programmable carrier output – using 9-bit timer
• High Driving Current Output pin
• Single Time-Base function for generation of fixed time interrupt signals
• Low voltage reset function
• Package types: 8-pin SOP, 16-pin NSOP, 20-pin NSOP/SSOP

Specification:

• max. frequency: 4MHz
• VDD: 2.0V~5.5V
• program memory: 1Kx14
• data memory: 32x8
• data EEPROM: -
• stack: 2
• I/O: 16
• timer: 9-bitx1
• interface: -
• case: 20SSOP