EM78P568

`Operating voltage : 2.2V5.5V
` 16k x 13 on chip Electrical One Time Programmable Read Only Memory (OTP-ROM)
` 1k x 8 on chip data RAM
`Up to 51 bi-directional tri-state I/O ports
`16 level stack for subroutine nesting
`8-bit real time clock/counter (TCC)
`two 8-bit counters : COUNTER1 and COUNTER2
`On-chip watchdog timer (WDT)
`99.9% single instruction cycle commands
`Four modes (Main clock can be programmed from 447.829k to 17.913MHz generated by internal PLL)
`Input port interrupt function
`8 interrupt source, 4 external, 8 internal
`Dual clocks operation (Internal PLL main clock , External 32.768KHz)

The EM78P568 is an 8-bit RISC type microprocessor with low power, high speed CMOS technology. There are 16Kx13 bits Electrical One Time Programmable Read Only Memory (OTP-ROM) within it. It provides security bits and  some One time programmable Option bits to protect the OTP memory code from any external access as well as to meet  user's options.

This integrated single chip has an on_chip watchdog timer (WDT), program OTP-ROM, data RAM, LCD driver,  programmable real time clock/counter, internal interrupt, power down mode, 8-bit D/A, 5-bit Comparator, DAC tone  generator, CTCSS analog circuit, programming dual tone generator and tri-state I/O.