User Manual

Manual ACM 9 - ARE i9 release
Version:
05
Page:
31 / 45
Manual ACM9_ARE i9 release V05.docx
3.3.17 LD (EM4305 chip specific)
After the chip is configured correctly, it may be necessary to lock specific memory blocks of EM 4305. Memory blocks from 0
to 13 can be locked. Memory pages 14 and 15 serve as lock data (see chip data sheet for details).
Protection word 1 is factory set, as it contains the chip UID. Memory pages 0, 2-13 can be locked by the user. This is OTP, so
once locked, it can not be undone.
Input format: LD<SP>00008072<CR>
Hex:
4C
44
20
30
...
30
37
32
0D
ASCII:
‘L’
‘D’
<SP>
‘0’
...
‘0’
‘7’
‘2’
<CR>
Output (example): ACK<CR>
Hex:
41
43
4B
0D
ASCII:
‘A’
‘C’
‘K’
<CR>
This answer is sent if lock data went ok.
Output (example): NAK<CR>
Hex:
4E
41
4B
0D
ASCII:
‘N’
‘A’
‘K’
<CR>
This answer is sent if something went wrong during lock data.
Above example locks memory pages 4, 5 and 6. Memory page 1 is factory set, as is the protection status bit.