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Table 9-15. Command format.
Command ID
Memory type
Offset
0
1
Field
(1)
(2)
Size
1 byte
1 byte
Values
XPRG_READ_MEM
Application, Boot, EEPROM, Fuse, Lockbits…
2
Address
(3)
4 bytes
Any address
6
Notes:
1.
2.
Length (4)
The command identifier
XPRG_MEM_TYPE_APPL
2 bytes
1 to 256
XPRG_MEM_TYPE_BOOT
XPRG_MEM_TYPE_EEPROM
XPRG_MEM_TYPE_FUSE
XPRG_MEM_TYPE_LOCKBITS
XPRG_MEM_TYPE_USERSIG
XPRG_MEM_TYPE_FACTORY_CALIBRATION
3.
4.
The start address of the data to be read. The address is in the TIF address space.
How many bytes to be read. It can be any value between 1 and 256.
Table 9-16. Answer format.
Command ID
Offset
0
Field
(1)
Size
1 byte
Values
XPRG_READ_MEM
1
Status
(2)
1 byte
Data
2
(3)
N bytes
Notes:
1.
2.
3.
The command identifier.
One of the defined error codes.
The requested memory area, lowest address first.
9.2.7 XPRG_READ_CRC
This command starts the CRC generator and returns a three-byte CRC.
Table 9-17. Command format.
Command ID
CRC type
Offset
0
1
Notes:
1.
2.
Field
(1)
(2)
The command identifier
XPRG_CRC_APP,
XPRG_CRC_BOOT
Size
1 byte
1 byte
Values
XPRG_READ_CRC
Application, Boot, or entire flash
or
XPRG_CRC_FLASH, see appendix.
38
AVR079
8133A-AVR-04/08
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