EM78P257
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 mA at 5V/4MHz
* typical of 15
µA,
at 3V/32KHz
* typical of 1
µA,
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 comparators.
• 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
* Comparators 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)
EMC [ ELAN MICROELECTRONICS CORP ]
