GENERAL DESCRIPTION
Integrated onto a single chip are on_chip watchdog (WDT) , RAM , ROM , programmable real time clock /counter , internal interrupt , power down mode , LCD driver , FSK decoder ,CALL WAITING decoder, SDT decoder, DTMF generator, MEI(Multiple Extension Internetworking) and RTF(Request To Flash) functions, and tri-state I/O . II.Feature CPU ¡E Operating voltage range : 2.5V¡ã 5.5V ¡E 16K¡Ñ 13 on chip Electrical One Time Programmable Read Only Memory (OTP-ROM) ¡E 2.8K¡Ñ 8 on chip RAM ¡E Up to 36 bi-directional tri-state I/O ports ¡E 8 level stack for subroutine nesting ¡E 8-bit real time clock/counter (TCC) ¡E Two sets of 8 bit counters can be interrupt sources ¡E Selective signal sources and trigger edges , and with overflow interrupt ¡E Programmable free running on chip watchdog timer ¡E 99.9¢H single instruction cycle commands ¡E Four modes (internal clock 3.579MHz) 1. Sleep mode : CPU and 3.579MHz clock turn off, 32.768KHz clock turn off 2. Idle mode : CPU and 3.579MHz clock turn off, 32.768KHz clock turn on 3.
ELAN Microelectronics
