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General Description

The EM78P259N is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology. The device has an on-chip 2Kx13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a protection bit to prevent intrusion of user s code. Three Code option words are also available to meet user s requirements.

With its enhanced OTP-ROM feature, the EM78P259N 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

2Kx13 bits on-chip ROM

80x8 bits on-chip registers (SRAM)

8-level stacks for subroutine nesting

Less than 1.9 mA at 5V/4MHz

Typically 15 uA, at 3V/32kHz

Typically 1 uA, during Sleep mode

I/O port configuration

3 bidirectional I/O ports : P5, P6, P7

17 I/O pins

Wake-up port : P5

8 Programmable pull-down I/O pins

8 programmable pull-high I/O pins

8 programmable open-drain I/O pins

External interrupt : P60

Operating voltage range

Operating voltage: 2.3V~5.5V (Commercial)

Operating voltage: 2.5V~5.5V (Industrial)

Operating temperature range

Operating temperature: 0°C ~70°C (Commercial)

Operating temperature: -40°C ~85°C (Industrial)

Operating frequency range

Crystal mode:

DC~20MHz/2clks @ 5V, DC~100ns inst. Cycle @ 5V

DC~8MHz/2clks @ 3V, DC~250ns inst. Cycle @ 3V

ERC mode:

DC~16MHz/2clks @ 5V, DC~125ns inst. Cycle @ 5V

DC~8MHz/2clks @ 3V, DC~250ns inst. Cycle @ 3V

IRC mode:

Oscillation mode : 4MHz, 8MHz, 1MHz, 455kHz

Internal RC FrequencyDrift Rate

Temperature(-40°C ~80°C )Voltage(2.3V~5.5V)ProcessTotal

4MHz±10%±5%±4%±19%

8MHz±10%±6%±4%±20%

1MHz±10%±5%±4%±19%

455kHz±10%±5%±4%±19%

All the four main frequencies can be trimmed by programming with four calibrated bits in the ICE259N Simulator. OTP is auto trimmed by ELAN Writer.

Peripheral configuration

8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt

8-bit real time clock/counter (TCCA, TCCC) and 16-bit real time clock/counter (TCCB) with selective signal sources, trigger edges, and overflow interrupt

4-bit channel Analog-to-Digital Converter with 12-bit resolution in Vref mode

Easily implemented IR (Infrared remote control) application circuit

One pair of comparators or OP

Six available interrupts:

TCC, TCCA, TCCB, TCCC overflow interrupt

Input-port status changed interrupt (wake-up from sleep mode)

External interrupt

ADC completion interrupt

Comparators status change interrupt

IR/PWM interruptn

Special features

Programmable free running watchdog timer (4.5ms : 18ms)

Power saving Sleep mode