EM785840/5841/5842

8-bit Micro-controller

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* This specification is subject to change without notice.

2

2004/11/10

V1.2

I. 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.

II. Feature

CPU

Main CLK(Hz)

Under 3.58M

14.3M

Operating Voltage(min)

2.2V

3.6V

•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)

Mode

CPU status

Main clock

32.768kHz clock status

Sleep mode

Turn off

Turn off

Turn off

Green mode

Turn on

Turn off

Turn on

Normal mode

Turn on

Turn on

Turn on

•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

Converter Rate

74.6K

37.4K

18.7K

9.3K

Operating Voltage(min)

3.5V

3.0V

2.5V

2.5V

POR

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