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以下我们对EM78P156N单片机基本功能特征的简单介绍，仅供参考：
特征
EM78P156N 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. 8 OPTION bits are also available to meet user’s requirements.
With its OTP-ROM feature, the EM78P156N is able to offer a convenient way of developing and verifying user’s programs. Moreover, user can take advantage of EMC Writer to easily program his development code.
EM78P156N 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.
* 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 霢 at 3V/32KHz
* Typically 1 霢 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
