General Description
The EM78P468NB is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology. It is integrated with 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 microprocessor is equipped with an on-chip 4K13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM) and provides multi-protection bits to prevent intrusion of user's OTP memory code. Seven Code option bits are available for your requirements. Special 13 bits customer ID options are provided as well.
With its enhanced OTP-ROM feature, the EM78P468NB provides a convenient way of developing and verifying your programs. Moreover, this OTP device offers the advantages of easy and effective program updates with development and programming tools. You can take advantage of ELAN's Writer to easily program his development codes.



 
Features
CPU Configuration
4K x 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
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: 
Commercial: 2.1V ~ 5.5 V (at 0℃ ~ +70℃)
Industrial: 2.3V ~ 5.5 V (at -40℃ ~ +85℃)
Operating Mode:
Normal Mode: The CPU operates on main oscillator frequency (Fm)
Green Mode: The CPU operates on sub-oscillator frequency (Fs) and the main oscillator (Fm) is stopped
Idle Mode: CPU is idle, LCD display remains working
Sleep Mode: The whole chip stops working
Input port wake-up function (Port 6, Port 8).
   Works under Idle and Sleep modes.
Operation speed: DC ~ 10MHz clock input
Dual clock operation
Oscillation Mode: 
High frequency oscillator can be selected from among Crystal, RC, or PLL (phase lock loop)
Low frequency oscillator can select between Crystal and RC modes
Peripheral Configuration: 
8-bit real time clock/counter (TCC)
One infrared transmitter / PWM generator
Four sets of 8-bit auto reload count-down timers which can be used as interrupt sources:
   * Counter 1: Independent count- down 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 operates under Normal, Green, and Idle modes.
Eight Interrupt Sources: Three External and Five Internal: 
Internal interrupt source: TCC; Counters 1, 2; and High/Low pulse width timer.
External interrupt source: INT0, INT1, and Pin change wake-up (Port 6 and Port 8)
LCD Circuit:
Common driver pins: 4
Segment driver pins: 32
LCD Bias: 1/3, 1/2 bias
LCD Duty: 1/4, 1/3, 1/2 duty
Package Type:
Dice form: 59 pins
QFP 64-pin: EM78P468NBQ64 (14mm x 20mm)
LQFP 64-pin: EM78P468NBL64 (7mm x 7mm)
Note: Green product do not contain hazardous substances