6F3B0250
5. Operating System Overview
5.2 About the built-in EEPROM
The T1/T1S is equipped with a
The user program is stored in the EEPROM so that the user program can be maintained without the need of a battery. A part of the Data register can also be stored in the
EEPROM.
The table below shows the contents stored in the
| T1 | T1S |
User program | Entire program (2 k steps) and | Entire program (8 k steps) and |
| System information | System information |
User data | Leading 512 words of Data | User specified number of Data |
| register (fixed). | register starting with address |
| D0000 - D0511 | 0. It is set by SW55. |
|
| D0000 - Dnnnn |
|
| (up to 2048 words) |
Other data | - | SW36 - SW38: |
|
| Programmer port settings |
|
| SW55: |
|
| Number of Data register to |
|
| be saved in the EEPROM |
|
| SW56 - SW57: |
|
|
The user program and the data stored in the EEPROM is transferred to the RAM when power is turned on. Subsequent program execution is done based on the RAM contents. Program editing is also performed on the RAM contents.
Therefore, if the program is modified, it is necessary to issue the EEPROM Write command from the programming tool. Otherwise, the modified program is over- written by original EEPROM contents when the power is turned off and on again.
84 T1/T1S User’s Manual
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