| Avr board | ||
|---|---|---|
 |
Chapter 8. Physical MC14500 implementation |  |
| Avr board | ||
|---|---|---|
| |
Chapter 8. Physical MC14500 implementation | |
The MC14500 CPU board runs autonomously and its EEPROM chip could be removed and programmed. The AVR board allows more modern features as in circuit programming of the EEPROM via a virtual COM connection on USB.
The commands are pure ASCII, therefore it will work with a standard terminal program as minicom. Sending the cat command lists all commands implemented.
Relevant commands are:
Table 8.1. Avr Commands
| rst | rst 1 puts the board in reset condition. rst 0 clears it and rst returns the rst status |
| data | data reads the data from the EEPROM. data <0..255> writes the data onto the EEPROM |
| clk_cpu | sets clock to low, so instruction data is latched to the CPU |
| clk_pc | sets clock to high and increases the programm counter |
| latch_mem | write pulse to the EEPROM to store the data |
| dir_read | The EEPROM puts its data on its pins |
| dir_write | The EEPROM reads data from its pins |
| clk_run | The AVR board toggles the clock line, so the program runs. clk_cpu or clk_pc will stop this. |
| |
|
|
| MC14500 CPU board |
|
Chapter 9. FPGA implementation |
