Editing Multi-purpose Embedded System

==Architecture==

===Hardware===
[[Image:Mpes hw archi.png]]
*MCU
**MCU can be 8-bit/16-bit/32-bit
**MCU should have sufficient RAM (i.e. no external RAM required)
**MCU should have program Flash (i.e. no external program flash required)
*Data Memory
**Use serial bus (I2C/SPI) to expand data memory to save I/O pins
**Need a file system to access the data
**EEPROM has a higher endurance (typically 10,000 cycles) for saving frequently write data
**Flash has a lower endurance (typically < 10,000 cycles) for saving less frequently write data (may not be true, to be confirmed)
*Communication
**RS232 for short distance one-to-one communication with PC
**RS485 for longer distance networked communication
**USB for USB communication with PC
**Ethernet for Internet connectivity
**GPIB for automated test equipment
*User Interface
**Graphical displays (LCD, VFD, etc.)
**Keypad for input
*Sensory Control
**ADC for analog feedback signals
**DAC for analog control signals
**GPIO for digital feedback and control signals