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