I. General Description
The EM78P5840 series are 8-bit RISC type microprocessor with low power, high speedCMOS technology. There are 4Kx13 bits Electrical One Time Programmable Read Only Memory (OTP-ROM) within it. It provides security bits and some One time programmable Option bits to protect the OTP memory code from any external access as well as to meet user’s options.

II. Feature
CPU
· Operating voltage : 2.2V~5.5V at main CLK less then 3.58MHz. 
‧ 4k x 13 on chip Electrical One Time Programmable Read Only Memory (OTP-ROM)
‧ 144 x 8 on chip general propose RAM
‧ Up to 19 bi-directional and 3 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)
‧ 99.9％ single instruction cycle commands
  Three 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
EM78P5840M Æ18 pin SOP, EM78P5841M Æ20 pin SOP, EM78P5842M Æ24 pin SOP
EM78P5840P Æ18 pin PDIP, EM78P5841P Æ20 pin PDIP, EM78P5842P Æ24 pin PDIP

III. Application
General products application.