EM78860

EM78860 8-BIT MICRO-CONTROLLER GENERAL DESCRIPTION The EM78860 is an 8-bit RISC type microprocessor with low power , high speed CMOS technology . Integrated onto a single chip are on_chip watchdog (WDT) , RAM , ROM , programmable real time clock / counter , internal interrupt , power down mode , LCD driver and tri-state I/O . The EM78860 provides a single chip solution to design a message display . FEATURES CPU Operating voltage range : 2.5V~5.5V 16Kx13 on chip ROM 2.8Kx8 on chip RAM Up to 32 bi-directional tri-state I/O ports 8 Level stack for subroutine nesting 8-bit real time clock/counter (TCC) Two sets of 8 bit counters can be interrupt sources Selective signal sources and with overflow interrupt Programmable free running on chip watchdog timer 99.9% single instruction cycle commands Four modes (internal clock 3.679MHz, external 32.768KHz) 1. Sleep mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn off 2. Idle mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn on 3. Green mode : 3.679MHz clock turn off, CPU and 32.768KHz clock turn on 4. Normal mode : 3.679MHz clock turn on , CPU and 32.768KHz clock turn on Low battery detector Input port wake up function 8 interrupt source , 4 external , 3 internal 100 pin QFP or chip Port key scan function Port interrupt , pull high and open drain functions Clock frequency 32.768KHz externally LCD LCD operation voltage chosen by software Common driver pins : 16 Segment dri...