General Description
The EM78P5840N/41N/42N series are 8-bit RISC architecture microcontroller devices designed and developed with low-power, high-speed CMOS technology. Each of these devices has on-chip 4K×13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a protection bit to prevent intrusion of user’s OTP memory code as well as from unwanted external accesses. A number of one-time programmable option bits are also available to meet user’s application requirements.

Features
CPU
■ Operating voltage: 2.2V~5.5V at the main CLK (less than 3.58MHz)
    Main CLK fSYS < 3.58MHz: 2.2V
    Main CLK fSYS = 14.3MHz: 3.6V
■ IRC mode: 4MHz, 2MHz
    Voltage deviation: ±5% (2.3V~5.5V)
    Process deviation: Typ. ±3%, Max. ±5%
    Temperature deviation: ±5% (-40°C~85°C)
■ 4K x 13 OTP-ROM
■ 144 x 8 general propose RAM
■ 19 bi-directional and three input-only general purpose I/O
■ 8-level stack for subroutine nesting
■ 8-bit real time clock/counter (TCC)
■ One 8-bit counter interrupt
■ On-chip watchdog timer (WDT)
■ Single-instruction cycle commands
■ Three operation modes using crystal oscillator (Main clock can be programmed to 3.58 MHz or 14.3 MHz):
■ Two Normal mode frequency levels: 3.58 MHz and 14.3 MHz
■ Input port interrupt function
■ Dual-clock operation (Internal PLL main clock, External 32.768kHz)

Operating Frequency Mode
■ Crystal mode (the XIN and XOUT pins are connected to the external crystal and capacitor)
■ ERIC mode (the ERCI pin connects the resistor to VDD)
■ IRC mode

PWM
■ Dual PWM (Pulse Width Modulation) with 10-bit resolution
■ Programmable period (or baud rate)
■ Programmable duty cycle

ADC
■ Operating voltage: 2.5V～5.5V
■ 8-channel 10-bit successive approximation A/D converter
■ Internal (VDD) reference voltage

POR
■ Power-on reset

Package Type
    EM78P5840NM: 18-pin SOP EM78P5840NP: 18-pin PDIP
    EM78P5841NM: 20-pin SOP EM78P5841NP: 20-pin PDIP
    EM78P5842NP: 24-pin PDIP EM78P5842NK: 24-pin Skinny DIP