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EM785840/5841/5842
8-bit Micro-controller
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* This specification is subject to change without notice.
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
·
Operating voltage : 2.2V~5.5V at main CLK less then 3.58MHz.
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
Sleep mode
Turn off
Turn off
Green mode
Turn on
Turn off
Normal mode
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
·
Operating : 2.5V
5.5V
Converter Rate
74.6K
37.4K
Operating Voltage(min)
3.5V
3.0V
·
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
32.768kHz clock status
Turn off
Turn on
Turn on
18.7K
2.5V
9.3K
2.5V