HT95R22 -- I/O Type Phone 8-Bit MCU

General Description

The HT95R22 MCU is an 8-bit high performance, RISC architecture microcontroller device specially designed for telephone applications. Device flexibility is enhanced with its internal special features such as power-down and wake-up functions, DTMF generator, etc. These features combine to ensure applications require a minimum of external components and therefore reduce overall product costs.

Having the advantages of low-power consumption, high-performance, I/O flexibility as well as low-cost, the device has the versatility to suit a wide range of application possibilities such as deluxe feature phones, cordless phones, fax and answering machines, etc.

The device is best suited for phone products that comply with versatile dialer specification requirements for different areas or countries. The device is fully supported by the Holtek range of fully functional development and programming tools, providing a means for fast and efficient product development cycles.

Features

  • Operating voltage at fSYS= 3.58MHz: 2.2V~5.5V
  • 4Kx16 OTP type Program Memory
  • 576x8 Data Memory
  • 18 bidirectional I/Os with pull-high options
  • 2 NMOS output-only lines
  • External interrupt input
  • Dual 16-bit timers with interrupts
  • Timer external input
  • 8-level stack
  • 32768Hz system oscillator
  • 32768Hz to 3.58MHz frequency-up PLL circuit
  • Real time clock function
  • Watchdog timer function
  • PFD driver output
  • DTMF generator
  • Power-down and wake-up feature for power-saving
    operation: Idle mode, Sleep mode, Green mode and normal mode
  • Up to 1.117us instruction cycle with 3.58MHz system clock at VDD=2.2V~5.5V
  • Bit manipulation instructions
  • Table read function
  • 63 powerful instructions
  • All instructions executed in 1 or 2 machine cycles
  • Supported by comprehensive suite of hardware and software tools
  • 28-pin SOP package

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