General Description

The EM785840 series are 8-bit RISC type microprocessor with low power, high speed CMOS technology. There are 4Kx13 bits ROM within it. This integrated single chip has an on_chip watchdog timer (WDT), RAM, programmable real time clock/counter, internal interrupt, power down mode, dual PWM (Pulse Width Modulation), 8-channel 10-bit A/D converter and tri-state I/O.

Feature

CPU

• Operating voltage : 2.2V~5.5V at main CLK less then 3.58MHz.

• 4k x 13 on chip mask ROM

• 144 x 8 on chip general propose RAM

• Up to 21 bi-directional and 1 input only general purpose I/O (For 24 pin package)

• 8 level stack for subroutine nesting

• 8-bit real time clock/counter (TCC)

• One 8-bit counter interrupt

• On-chip watchdog timer (WDT)

• 99.9％ single instruction cycle commands

• Four action modes in Crystal mode (Main clock can be programmed to 3.58M or 14.3M Hz)

• 2 level Normal mode frequency: 3.58M and 14.3MHz.

• Input port interrupt function

• Dual clocks operation (Internal PLL main clock , External 32.768KHz)

Operating frequency mode

• Crystal mode (XIN,XOUT pin connect external crystal and capacitance)

• ERIC mode (ERCI pin connect resister to VDD)

• IRC mode

PWM

• Dual PWM (Pulse Width Modulation) with 10-bit resolution

• Programmable period (or baud rate)

• Programmable duty cycle

ADC

• Operating : 2.5V∼ 5.5V

• 8 channel 10-bit successive approximation A/D converter

• Internal (VDD) reference voltage

POR

• Power-on reset

PACKAGE

EM785840M -> 18 pin SOP, EM785841M -> 20 pin SOP, EM785842M -> 24 pin SOP

EM785840P -> 18 pin PDIP, EM785841P -> 20 pin PDIP, EM785842P -> 24 pin PDIP

Application

General products application.