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86 T1/T1S User’s Manual
5. Operating System Overvi ew
In case of the T1S, Special register SW55 is used to specify the number of Data registers
to be stored in t he EEPROM. The allowable setting value is 0 to 2048.
The table below shows the correspondence between the SW55 value and Data registers
saved in the EEPROM.
SW55 set t ing
value Range of Data register s saved in
EEPROM Remarks
0 None
1 D0000 only
2 D0000 to D0001
3 D0000 to D0002
::
2047 D0000 to D2046
2048 D0000 to D2027 Default value
Others D0000 to D2027 Regarded as 2048
When the EEPROM Write command is executed, the T1S checks the value of SW55 and
saves the Data registers into the EEPROM depending on the SW55 value. The value of
SW55 it self is also saved in the EEPROM.
At the initial load or the EEPROM Read command is executed, the T1S checks the value
for SW55 in the EEPROM and transf ers the corresponding number of data to the Dat a
register s of the RAM.
NOTE (1) The EEPROM has the life limit for writing . It is 100,000 t im es. Pay
attention not to exceed the limit. I f the number of execution of EEPRO M
Wr it e com m and exceeds 100,000 t im es, EEPROM alarm flag ( S007)
comes ON.
(2) I n the T1S, if the EEPRO M Write command is executed in RUN m ode,
only the user prog ram is written int o the EEPROM.
(3) T he data in the EEPROM (D0000 to D0511 or D0000 to D2047) can also
be read or written by using the program instruction (FUN236 XFER
instruction).
(4) The SW55 set ting is available only for t he T1S.
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