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)
