B3-1

EM78P156E

I.

GENERAL DESCRIPTION

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.

II.

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

µA at 3V/32KHz

* typical of 1

µA 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