Toshiba 6F3B0253 - Manual (Page 244)

6F3B0253
242
T1-16S User’s Manual
7. Instructions
CPU register
↔ ↔ ↔ ↔
built-in EEPROM
In the EEPROM, the D registers are divided into pages as follows.
T1-16S
D0000 Page 1
(32 words)
D0031
D0032
Page 2
(32 words)
D0063
D2016 Page 64
(32 words)
D2047
Example
When R020 is changed from OFF to ON, 10 words of RAM data (D0700 to D0709) are written
into the EEPROM (D0016 to D0025).
D1000 (H0004) and D1001 (700) indicate the leading register of the source table (D0700 in
RAM). D1002 (10) indicates the transfer size (10 words = 10 registers). D1003 (H0020 = 32)
and D1004 (16) indicate the leading register of the destination table (D0016 in EEPROM).
Note
•
The XFER instruction is not executed as error in the following cases. In these cases, the
instruction error flag (ERF = S051) is set to ON. If the ERF is set to ON once, it remains ON until
resetting to OFF by user program.
(1) When the number of words transferred exceeds limit.
(2) When the source/destination table of transfer is out of the valid range.
(3) When the transfer combination is invalid.
•
The EEPROM has a life limit for data writing into an address. It is 100,000 times. Pay attention
not to exceed the limit. (EEPROM alarm flag = S007 is not updated by this instruction)
•
Once data writing into the EEPROM is executed, EEPROM access (read/write) is prohibited for
the duration of 10 ms. Therefore, minimum 10 ms interval is necessary for data writing.
•
The XFER instruction can be programmed in the main program and in the interrupt program.
If this instruction is programmed in both, the instruction in the main program should be executed
in interrupt disable state. Refer to EI (FUN 140) and DI (FUN 141) instructions.
•
Writing data into the EEPROM is
available within one page at a
time. (max. 32 words)
•
For data reading from the
EEPROM, there is no need to
consider the pages.