Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 174)

DS4830 User’s Guide
174
22.3.4 - Command 03h
– Password Match
Byte 1 Bytes 2 to 33 Byte 34 Byte 35
Command Data In NOP Return
Input 03h 32-Byte Password 00h 00h
Output X X X 3Eh
This command accepts a 32-byte password value, which is matched against the password in program memory from byte
address 0020h through 003Fh. If the entered value matches the password in program memory, the password lock bit will
be cleared. This command is not password protected.
22.3.5 - Command 04h
– Get Status
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Command NOP Data Out Data Out Return
Input 04h 00h 00h 00h 00h
Output X X Flags Status Code 3Eh
The Status Flags and Status Code returned by the Get Status command are defined in Tables 22-6 and 22-7. This
command is not password protected. The Status Codes will be set whenever an error condition occurs and will only
reflect the last error. The Status Codes will be cleared

When the bootloader is initially entered

At the start of execution of all commands except Family 0 commands

At the start of execution of the Family 0 Master Erase and Set Access Mode commands
Table 22-6. Bootloader Status Flags
Flag Bit Meaning
8:3 Reserved.
2 Word/Byte Mode Supported.
0
– The bootloader supports byte mode only.
1 – The bootloader supports word mode as well as byte mode.
(Note: the DS4830 supports byte mode only)
1 Word/Byte Mode.
0
– The bootloader is currently in byte mode for memory reads/writes.
1 – The bootloader is currently in word mode for memory reads/writes.
(Note: the DS4830 supports byte mode only)
0 Password Lock. This bit will match the SC.PWL bit.
0
– The password is unlocked or had a default value; password-protected commands may be
used.
1
– The password is locked. Password-protected commands may not be used.
Table 22-7. Bootloader Status Codes
Status Value Meaning
00 No Error. The last command completed successfully.
01 Family Not Supported. An attempt was made to use a command from a family which the
bootloader does not support.
02 Invalid Command. An attempt was made to use a nonexistent command within a
supported command family.
03 No Password Match. An attempt was made to use a password-protected command
without first matching a valid password. Or, the Password Match command was called
with an incorrect password value.
04 Bad Parameter. An input parameter passed to the command was out of range or
otherwise invalid.
05 Verify Failed. The verification step failed on a Load/Verify or Verify command.
06 Unknown Register. An attempt was made to read from or write to a nonexistent register.
07 Word Mode Not Supported. An attempt was made to set word mode access, but the
bootloader supports byte mode access only.
08 Master Erase Failed. The bootloader was unable to perform master erase.