E1-10
IM 34M06H62-02E 2nd Edition : June 2008-00
Common Precautions for Registers
In Tables E1.1 to E1.10, only data registers specified with symbol and description are valid
data registers provided with this module. Data registers displayed with gray background
or labeled as "not used" in the "Description" column are invalid.
Any data written to an invalid register is ignored, causing no adverse effect on module
operation. If you read from such invalid registers, the written value or a register-specific
value is returned. The register-specific value may or may not be a fixed value.
The “Attribute” column in a table indicates whether a register can be read and written.
“RO” indicates a read-only register, whilst “RW” indicates a register that can be read, as
well as written.
A “” mark in the “Stored” column indicates that the content of the register is stored, and
need not be re-written to the module after power off and on. When changing the value of a
stored register, beware, however, that there is a maximum limit to the number of write
operations allowed on the EEPROM. By default, writing to a stored register updates the
data stored in the EEPROM. To suspend this updating of the EEPROM, you should
disable the backup function.
Up to 100,000 write operations to the EEPROM are allowed. Beware that this write limit
may be exceeded if registers with a “” mark in the “Stored” column are frequently
updated. In such situations, you should disable the backup function by setting
“NBKUP=1”. Note, however, that the NBKUP register value itself is not stored, and is
always reset to 0 at power up.
CAUTION
CAUTION
CAUTION
To Next Page
Loading...
Need help?
General
