IBM EM78P447N manual General Description, Features

EM78P447N

8-Bit Microcontroller with OTP ROM

1 GENERAL DESCRIPTION

EM78P447N is an 8-bit microprocessor with low-power and high-speed CMOS technology and high noise immunity. It is equipped with 4K*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. Seven OPTION bits are also available to meet user’s requirements.

With its OTP-ROM feature, the EM78P447N is able to offer a convenient way of developing and verifying user’s programs. Moreover, user can take advantage of ELAN Writer to easily program his development code.

2 FEATURES

Operating voltage range: 2.5V~5.5V.

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

Operating frequency rang( base on 2 clocks)

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

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

Low power consumption:

•Less then 2.2 mA at 5V/4MHz

•Typically 35 ∝A, at 3V/32KHz

•Typically 2 ∝A, during sleep mode

4K ⋅ 13 bits on chip ROM

Three protection bits to prevent intrusion of OTP memory codes

One configuration register to accommodate user’s requirements

148⋅ 8 bits on chip registers(SRAM, general purpose register)

3 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

Two available interruptions

•TCC overflow interrupt

•External interrupt

Product Specification (V1.1) 03.30.2005 • 1

(This specification is subject to change without further notice)