EM785840/5841/5842
8-bit Micro-controller
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
Sleep mode
Green mode
CPU status
Turn off
Turn on
Main clock
Turn off
Turn off
Turn on
32.768kHz clock status
Turn off
Turn on
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
Operating Voltage(min)
74.6K
3.5V
37.4K
3.0V
18.7K
2.5V
9.3K
2.5V
· 8 channel 10-bit successive approximation A/D converter
· Internal (VDD) reference voltage
POR
· Power-on reset
PACKAGE
EM785840M Æ 18 pin SOP, EM785841M Æ 20 pin SOP, EM785842M Æ 24 pin SOP
EM785840P Æ 18 pin PDIP, EM785841P Æ 20 pin PDIP, EM785842P Æ 24 pin PDIP
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* This specification is subject to change without notice.
2
2004/11/10 V1.2
ELAN [ ELAN MICROELECTRONICS CORP ]
