HT95R22 Datasheet | Holtek Semiconductor

Features - Operating voltage at f SYS= 3.58MHz: 2.2V~5.5V - 4K´16 OTP type Program Memory - 576´8 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 - DTMF generator - Power-down and wake-up feature for power-saving operation: Idle mode, Sleep mode, Green mode and normal mode - Up to 1.117ms 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 prehensive suite of hardware and software tools - 28-pin SOP package 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 bine to ensure applications require a minimum of external ponents 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 ply 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. Rev. 1.00 January 6, 2009 .. Block Diagram W a tc h d o g T im e r W a tc h d o g T im e r O s c illa to r R e s e t C ir c u it In te rru p t C o n tr o lle r...