The EM78P468N/L is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS

　　technology. Integrated onto a single chip are on chip Watchdog Timer (WDT), Data RAM, ROM, programmable real time

　　clock counter, internal/external interrupt, power down mode, LCD driver, infrared transmitter function, and tri-state I/O.

　　The series has an on-chip 4K×13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). The

　　EM78P468L provides multi-protection bits to prevent intrusion of user’s OTP memory code. Seven Code option bits are

　　available to meet user’s requirements. Special 13 bits customer ID options are provided as well.

　　With its enhanced OTP-ROM feature, the EM78P468N/L provides a convenient way of developing and verifying user’s

　　programs. Moreover, this OTP device offers the advantages of easy and effective program updates, using development

　　and programming tools. User can avail of the ELAN Writer to easily program his development code.

　　Features

　　CPU Configuration

　　• 4K×13 bits on-chip OTP-ROM

　　• 144 bytes general purpose register

　　• 128 bytes on-chip data RAM

　　• 272 bytes SRAM

　　• 8 level stacks for subroutine nesting

　　• Power-on voltage detector provided (2.0±0.1V) for

　　EM78P468N

　　• Power-on voltage detector provided (1.7±0.1V) for

　　EM78P468L

　　I/O Port Configuration

　　• Typically, 12 bi-directional tri-state I/O ports.

　　• 16 bi-directional tri-state I/O ports shared with LCD

　　segment output pin.

　　• Up to 28 bi-directional tri-state I/O ports

　　Operating Voltage and Temperature Range:

　　Peripheral Configuration

　　• 8-bit real time clock/counter (TCC)

　　• One infrared transmitter / PWM generator function

　　• Four sets of 8 bits auto reload down-count timer

　　can be used as interrupt sources

　　♦ Counter 1: independent down-count timer

　　♦ Counter 2, High Pulse Width Timer (HPWT), and

　　Low Pulse Width Timer (LPWT) shared with IR

　　function.

　　♦ Programmable free running on chip watchdog

　　timer (WDT). This function can operate on

　　Normal, Green and Idle mode.

　　Eight Interrupt Sources: Three External and Five

　　Internal

　　• Internal interrupt source: TCC; Counters 1, 2;

　　High/Low pulse width timer.

　　• External interrupt source : INT0, INT1 and Pin

　　change wake-up (Port 6 and Port 8)