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EM78P142

8-Bit Microprocessor with OTP ROM

ELAN Microelectronics 

EM78P142

8-Bit Microprocessor with OTP ROM

1 General Description

The EM78P142 is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology.

The series have an on-chip 2K×13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a

protection bit to prevent intrusion of user’s OTP memory code. Three Code option bits are also available to meet user’s

requirements.

With enhanced OTP-ROM features, the EM78P142 provide 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.

2 Features

„ CPU configuration

• 2K×13 bits on-chip ROM

• 80×8 bits on-chip registers (SRAM)

• 8-level stacks for subroutine nesting

• 4 programmable Level Voltage Detector

(LVD) : 4.5V, 4.0V, 3.3V, 2.2V

• 3 programmable Level Voltage Reset

(LVR) : 4.0V, 3.5V, 2.4V

• Less than 1.5 mA at 5V/4MHz

• Typically 15 µA, at 3V/32kHz

• Typically 2 µA, during sleep mode

„ I/O port configuration

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

• 8 I/O pins

• Wake-up port : P5

• 5 programmable pull-down I/O pins

• 6 programmable pull-high I/O pins

• 1 programmable open-drain I/O pins

„ Operating voltage range:

• 2.1V~5.5V at 0°C~70°C (commercial)

• 2.3V~5.5V at -40°C~85°C (industrial)

„ Operating frequency range (base on 2 clocks):

• Crystal mode: DC ~ 16MHz, 4.5V;

DC ~ 8MHz, 3V; DC ~ 4MHz, 2.1V

• ERC mode: DC ~ 16MHz, 4.5V;

DC ~ 125ns inst. cycle, 4.5V

DC ~ 8MHz, 3V; DC ~ 250ns inst. cycle, 3V

• IRC mode

Oscillation mode: 16MHz, 4MHz, 1MHz, 455kHz

„ Fast set-up time requires only 0.8ms (VDD: 5V

Crystal: 4MHz, C1/C2: 30pF) in HXT2 mode and 10µs

in IRC mode (VDD: 5V, IRC: 4 MHz)

„ Peripheral configuration

• Easily implemented IR (infrared remote control)

• 8-bit real time clock (TCC) with overflow interrupt

• 8-bit real time clock (TCCA, TCCC) and 16-bit real

time clock (TCCB) with overflow interrupt

• 7-bit multi-channel Analog-to-Digital Converter with

12-bit resolution in Vref mode

„ Five available interrupts

• TCC, TCCA, TCCB, TCCC overflow interrupt

• Input-port status changed interrupt (wake up from

sleep mode)

• ADC completion interrupt

• IR/PWM period match completion

• Low voltage detect (LVD) interrupt

„ Special Features:

• Programmable free running Watchdog Timer

(4.5 ms : 18 ms)

• Power saving Sleep mode

• Selectable Oscillation mode

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

• High EFT immunity (better performance at 4 MHz or

below)

„ Package Type:

• 10 pin SSOP 150mil : EM78P142SS10J/S

Note: Green products do not contain hazardous .substances.

Internal RC

Frequency Temperature

(-40°C~85°C)

Drift Rate

Voltage

(2.3V~5.5V)

Process

Total

4 MHz

16 MHz

1 MHz

455kHz

±5%

±5%

±5%

±5%

±5%

±5%

±5%

±5%

±4%

±4%

±4%

±4%

±14%

±14%

±14%

±14%

„ All the four main frequencies can be trimmed by

programming with four calibrated bits in the ICE341N

Simulator. OTP is auto trimmed by ELAN Writer.

Product Specification (V1.0) 01.25.2008

•1

(This specification is subject to change without further notice)

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