The HT68F2420 device is a Flash Memory type 8-bit high performance RISC architecture microcontroller designed for IR remote controllers and IR transmission related products.

For memory features, the Flash Memory offers users the convenience of multi-programming features. Other memory includes an area of RAM Data Memory. Protective features such as an internal Watchdog Timer coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

The device includes a 9-bit timer for IR carrier output, a Time-base function which can generate fixed time interrupt. An internal high precision 4MHz oscillator and an internal 32kHz oscillator which require no external components for their implementation are provided for the system clock and other functions. 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 precision clock, a timing function or a high driving current.

Features

• Operating Voltage: fSYS = 4MHz: 1.8V~5.5V
• Up to 1us instruction cycle with 4MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Oscillator
  • 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

• Flash Program Memory: 1K×13
• 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
• One Time-Base function for generation of fixed time interrupt signals
• Flash program memory can be re-programmed up to 10,000 times
• Flash program memory data retention > 10 years
• Low voltage reset function
• Package types: 8-pin SOP, 16-pin NSOP, 20-pin NSOP, 20-pin SSOP

Specification:

• max. frequency: 4MHz
• VDD: 1.8V~5.5V
• program memory: 1Kx13
• data memory: 32x8
• data EEPROM: -
• stack: 2
• I/O: 16
• timer: 9-bitx1
• interface: -
• case: 8SOP