DS1977 − Password Protected 32kbit Memory iButton
Non-volatile memory.
37 [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-510|ALL] | set_number/full | set_number/read | set_password/enabled | set_password/full | set_password/read | use_number/full | use_number/read | use_password/full | use_password/read | ]]
37 DS1977
read-write,
binary
32704 bytes of memory. Possibly protected by a password.
read-write,
binary
Memory is split into 511 pages of 64 bytes each. ALL
is an aggregate of the pages. Each page is accessed
sequentially.
write-only,
ascii
Passwords entered as numbers, either decimal, or hex of form
0x0123456789ABCDEF. Handled the same as
set_password/xxx
read-write,
yes-no
Turn on/off password protection for the DS1977, or return
the current state.
write-only,
binary
Passwords (8 byte values) that allow read or full access to
the DS1977 memory. The password set by
set_password/xxx are stored in the DS1977 and locally
in the program as well (as if use_password/xxx was
also called).
write-only,
binary
Passwords (8 byte values) that allow read or full access to
the DS1977 memory. The password set by
write-only,
ascii
Passwords entered as numbers, either decimal, or hex of form
0x0123456789ABCDEF. Handled the same as
use_password/xxx
write-only,
binary
Passwords (8 byte values) that allow read or full access to
the DS1977 memory. The password set by
use_password/xxx are stored in the program and must
match the passwords stored in the DS1977. Changing the
DS1977 passwords using set_password/xxx will change
these values as well. use_password/xxx are stored in
the program and must match the passwords stored in the
DS1977. Changing the DS1977 passwords using
set_password/xxx will change these values as
well.
None.
The DS1977 (3) is an iButton with static memory that is optionally protected by a password.
http://pdfserv.maxim-ic.com/en/ds/DS1977.pdf
http://www.owfs.org
Paul Alfille ([email protected])