FEATURES
: * Operating voltage : 2.5V - 6V. * Maximum CPU operating frequency : 4MHz at 5V and 1.5MHz at 2.5V * Dual oscillators : - 32.768 KHz crystal oscillator for LCD display and watch timer. - RC oscillator for system clock. * 40 segments and 16 commons output for LCD driver. - 1/5 bias, 1/16 duty and 64Hz frame frequency. - 1/4 bias, 1/8 duty and 128Hz frame frequency. * I/O port. - 30 I/O pins. - Port 1 with selectable interrupt. * Built in 2K bytes RAM (including LCD storage area). * Built in 8K bytes ROM for program. * One 8-bit timer with 8 predefined input clock. * Five interrupt sources : NMI - 64 Hz interrupt IRQ1 - Stopwatch timer interrupt IRQ2 - Fix-time timer interrupt IRQ3 - Timer interrupt IRQ4 - External interrupt * Code option : - Built-in 150K OHM pull-up resistors for I/O port. - 1/8 duty or 1/16 duty. STK55C641 2. APPLICATION : * Data bank * Calculator * Hand-held game * Small instrument * Toy LCD Controller 1/1 ISSUE DATE : 3 March, 2000 Syntek Semiconductor Co., Ltd 3.
Syntek Semiconductor
