General Description
The EM78862B is an 8-bit RISC type microprocessor with low power, high speed CMOS technology. Integrated into the 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 EM78862B provides a single chip solution for designing DATA-BANK of message display.

FEATUREs
CPU
„ Operating voltage range: 2.2V ~ 5.5V
„ 16K X 13 on chip ROM
„ 2.2K X 8 on chip RAM
„ Up to 29 bi-directional and 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
„ Programmable free running on chip watchdog timer
„ Four modes (internal PLL clock 3.579MHz)
   •SLEEP Mode: CPU and 3.579MHz clock turn off, 32.768KHz clock turn off
   •IDLE Mode: CPU and 3.579MHz clock turn off, 32.768KHz clock turn on
   •GREEN Mode: 3.579MHz clock turn off, CPU and 32.768KHz clock turn on
   •NORMAL Mode:3.579MHz clock turn on, CPU and 32.768KHz clock turn on
„ Input port wake up function
„ Seven interrupt sources; 4 external, 3 internal
„ 84-pin chip (EM78862BH)
„ Port key scan function
„ Clock frequency 32.768KHz or RC mode
„ Eight R-option pins
LCD
„ Software selectable LCD operation voltage
„ Common driver pins:9
„ Segment driver pins:60
 „1/4 bias
„ 1/8, 1/9 duty

APPLICATIONs
„Data Bank
Message display box
„Scientific calculator