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EM78P157N

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P157N

8-Bit Microcontroller with OTP ROM

1 General Description

EM78P157N is an 8-bit microprocessor designed and developed with low-power,

high-speed CMOS technology. It is equipped with 1K*13-bits Electrical One Time

Programmable Read Only Memory (OTP-ROM). It provides three PROTECTION bits

to prevent user’s code in the OTP memory from being intruded. Eight OPTION bits are

also provided to meet user’s additional requirements.

With its OTP-ROM feature, the EM78P157N is able to offer a convenient way of

developing and verifying user’s programs. Moreover, user can take advantage of

ELAN DWriter to easily program his development code.

2 Features

„ Operating voltage range: 2.5V~5.5V

„ Operating temperature range: -40°C~85°C

„ Operating frequency range (base on 2 clocks ):

• Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.5V.

• ERC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.5V.

„ Low power consumption:

• Less then 2 mA at 5V/4MHz

• Typically 20 µA at 3V/32KHz

• Typically 1 µA during sleep mode

„ 1K × 13 bits on chip ROM

„ One security register to prevent intrusion of OTP memory codes

„ One configuration register to accommodate user’s requirements

„ 48× 8 bits on chip registers (SRAM, general purpose register)

„ 2 bi-directional I/O ports

„ 5 level stacks for subroutine nesting

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

overflow interrupt

„ Two clocks per instruction cycle

„ Power down (SLEEP) mode

„ Three available interruptions

• TCC overflow interrupt

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

• External interrupt

Product Specification (V1.0) 09.22.2005

•1

(This specification is subject to change without further notice)

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