EM78P451S
8-Bit Microcontroller with OTP ROM
1 GENERAL DESCRIPTION
The EM78P451S is an 8-bit microprocessor designed and developed with low-power,
high speed CMOS technology. Its operational kernel is implemented with RISC-like
architecture and is available in the mask ROM version. The one time programmable
(OTP) version is flexible, both in mass production or engineering test stages. OTP
provide users with unlimited volume with favorable price opportunities. This device is
equipped with the Serial Peripheral Interface (SPI) function. The EM78P451S is very
suitable for wired communication. Only 58 easy-to-learn instructions are needed and
user’s program can be emulated with EMC In-Circuit Emulator (ICE).
2 FEATURES
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Operating voltage range: 2.3V~5.5V.
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Operating temperature range: 0°C~70°C.
Operating frequency range (base on 2 clocks ):
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Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.3V.
RC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.3V.
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Low power consumption:
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Less then 3 mA at 5V/4MHz
Typically 10 µA during sleep mode
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Serial Peripheral Interface (SPI) available.
4K × 13 bits on chip ROM (EM78P451S).
11 special function registers.
140× 8 bits on chip general-purposed registers.
5 bi-directional I/O ports (35 I/O pins).
3 LED direct sinking pins with internal serial resistors.
Built-in RC oscillator with external serial resistor, ±10% variation.
Built-in power-on reset.
5 stacks for subroutine nesting.
8-bit real time clock/counter (TCC) with overflow interrupt.
Two machine clocks or four machine clocks per instruction cycle.
Power down mode.
Programmable wake up from sleep circuit on I/O ports.
Programmable free running on-chip watchdog timer.
Product Specification (V1.0) 06.01.2004
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(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
