下面是有关EM78P156E单片机的主要功能特征介绍，供客户及技术工程师在芯片解密项目及技术实现过程中进行技术参考和借鉴。

EM78P156E is an 8-bit microprocessor with low-power and high-speed CMOS technology. There is a 1K*13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM) within it. It provides a PROTECTION bit to prevent a user’s code from intruding as well as 7 OPTION bits to match the user’s requirements.

Because of the OTP-ROM, the EM78P156E offers users a convenient way to develop and verify their programs.Moreover, a user’s developed code can be programmed easily by an EMC writer.

FEATURES

Operating voltage range: 2.2V~5.5V

Available in temperature range: 0°C~70°C

Operating frequency range: DC ~ 36MHz

Low power consumption:

* less than 1.6 mA at 5V/4MHz

* typical of 15 mA at 3V/32KHz

* typical of 1 mA during the sleep mode

1Kx13 bits on chip ROM

One security register to prevent the code in the OTP memory from intruding

One configuration register to match the user’s requirements

48x8 bits on chip registers (SRAM)

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 mode (SLEEP mode)

Three available interruptions

* TCC overflow interrupt

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

* External interrupt

Programmable free running watchdog timer

8 pull-high pins

7 pull-down pins

8 open-drain pins

Two R-option pins

Package type: SOP, SOIC and DIP

99.9% single instruction cycle commands