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