EM78P257 Datasheet | ELAN Microelectronics

DESCRIPTION EM78P257A/B is an 8-bit microprocessors with low-power, high speed CMOS technology. It features a 2K- 13 bits Electrical One Time Programmable Read Only Memory (OTP -ROM) and provides a protect bit to prevent from intruding on code, as well as 12 Option bits to acmodate user’s requirements. This specification is subject to change without prior notice. 07.27.2004 (V1.4) OTP ROM 2. FEATURES - Operating voltage range: 2.3V~5.5V - Operating temperature range: 0°C~70°C - Operating frequency range: (Base on 2 clocks) - Crystal mode: DC ~ 20MHz/2clks,5V; DC ~ 8MHz/2clks,3V - RC mode: DC ~ 4MHz/2clks,5V; DC ~ 4MHz/2clks,3V - Low power consumption: - less then 1.5 m A at 5V/4MHz - typical of 15 µ A, at 3V/32KHz - typical of 1 µ A, during the sleep mode - Built-in RC oscillator(4MHz,1MHz,455KHz,32.768KHz) - RC oscillator mode with Internal Capacitor - Programmable oscillator set-up time (1ms:18ms) - Independent Programmable prescaler of WDT. - One configuration register to match the user’s requirements, and provide user’s ID code for customer use - 80× 8 on chip registers (SRAM, general purpose register) - 2K × 13 on chip ROM - Bi-directional I/O ports. - 8 level stacks for subroutine nesting - 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt. - 4 sets of parators. - Easy-implemented IR (Infrared remote control) application circuit. - Easy-implemented MOUSE application circuit. - Power down (SLEEP) mode - Five interrupt sources - TCC overflow interrupt - Input-port status changed interrupt(wake up from the sleep mode) - External interrupt - IR OUT interrupt - parators status change interrupt - Programmable free running watchdog timer - 8 programmable pull-high I/O pins This specification is subject to change without prior notice. 4 07.27.2004 (V1.4) OTP...