Advertisement
In some single-chip microcomputers, some special programming modes are allowed
to be set, such as the storage area mapping, the watchdog time, the clock, the
encryption, etc. They are all set through the device configuration word. The
configuration words of some devices are contained in the user files and are
automatically loaded into the configuration word buffer along with the data files
when the files are loaded. As for the loading of the configuration words of the other
devices, some selections must be made manually.
The configuration word for DALLAS DS89C420 is shown in the below figure. It
contains the watchdog and three protection modes.
As for some single-chip microcomputers, the configuration word has many items
which may be placed in some separate pages. The items on each page should be set
before a chip is programmed.
There are several ways to input the configuration word: the 8-bit (byte) edit box input,
the 16-bit (word) edit box input, the single choice input (select and deselect, choose
one out of two), the multiple choice input (choose one out of many).
The configuration words are classified into two categories when chips are
36
Advertisement
