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EM78P447N
8-Bit Microcontroller with OTP ROM
Product Specification (V1.1) 03.30.2005
• 1
(This specification is subject to change without further notice)
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 µA, at 3V/32KHz
• Typically 2 µA, 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