Difference between revisions of "Multi-purpose Embedded System"

Revision as of 01:52, 26 November 2008

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 for small block of re-writable data
- Flash for large block of re-writable data
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

@@ Line 10: / Line 10: @@
 **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
+**EEPROM for small block of re-writable data
-**Flash has a lower endurance (typically < 10,000 cycles) for saving less frequently write data (may not be true, to be confirmed)
+**Flash for large block of re-writable data
 *Communication
 **RS232 for short distance one-to-one communication with PC