General Description

EM78P159N 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.

Features

■ Operating voltage range:

? 2.1V~5.5V at 0°C~70°C

? 2.3V~5.5V at 40°C~85°C

■ Operating frequency range (base on 2 clocks ):

? Crystal mode: DC~20MHz at 5.0V, DC~8MHz at 3.0V, DC~4MHz at 2.1V

? ERC mode: DC~4MHz at 5.0~2.1V

? IRC mode: 4 choices of frequencies available; i.e., 8M, 4M, 1M, & 455kHz

■ IRC mode:

? All these four main frequencies can be trimmed by programming with four calibrated bits in the ICE159N Simulator. OTP is auto trimmed by DWTR.

? Temperature, Voltage, and Process changes will influence the frequency drift

? Frequency deviation is only ±4.5 after auto trimming (based on Vdd=5V, Ta=25°C)

■ Fast set-up time only requires about 2ms in high XTAL and 32CLKS in IRC mode from wake up to operating mode

■ Low power consumption:

? Less then 2mA at 5V/4MHz

? Typically 20μA at 3V/32kHz

? Typically 1μA 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

■ Programmable free running watchdog timer

■ 8 programmable pull-high pins

■ 8 programmable pull-down pins

■ 8 programmable open-drain pins

■ 2 programmable R-option pins

■ Package types:

? 18 pin DIP 300mil : EM78P159NP

? 18 pin SOP 300mil : EM78P159NM

? 20 pin SSOP 209mil : EM78P159NAS

? 20 pin SSOP 209mil : EM78P159NKM

■ 99.9 single instruction cycle commands

■ The transient point of system frequency between HXT and LXT is around 400kHz