ACS AET63 BioTRUSTKey - Manual (Page 16)

7.2. EEPROM Commands
7.2.1. EEPROM_READ_DATA
This command is used to read the specified number of bytes from the specified address of the
EEPROM.
Command format
Instruction
Code
Data length Data
ADDR LEN
9A
H
03
H
ADDR Byte address of first byte to be read from the EEPROM. The high byte of the address
is specified as the first byte of ADDR.
LEN Number N of data bytes to be read from the EEPROM
(0 < N
≤ MAX_R)
Response data format
BYTE
1
BYTE
2
BYTE
3
... ... BYTE
N
BYTE x Data bytes read from the EEPROM memory
7.2.2. EEPROM_WRITE_DATA
This command is used to write the specified data bytes to the specified address of the EEPROM.
Note: The EEPROM used in AET63 is 24C512, with a page size of 64 bytes. The page write and
page alignment are not done in the firmware, and these should be done in the driver or application.
Command format
Instruction
Code
Data length Data
LEN ADDR BYTE 1 ... ... BYTE N
9B
H
LEN Number of data bytes to be written to the EEPROM, N, + 2
ADDR Byte address in the EEPROM of the first byte to be written. The high byte of the
address is specified as the first byte of ADDR.
BYTE x Byte values to be written to the EEPROM starting at address ADDR. BYTE 1 is
written to address ADDR; BYTE N is written to address ADDR+N-1.
Response data format
No response data
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