Rainbow Electronics DS2788 - Manual (Page 26)

D
S
2
7
8
8 Copy Data [48h, XX]. This command copies the con-
tents of the EEPROM shadow RAM to EEPROM cells for
the EEPROM block containing address XX. Copy data
commands that address locked blocks are ignored.
While the copy data command is executing, the EEC bit
in the EEPROM register is set to 1 and writes to
EEPROM addresses are ignored. Reads and writes to
non-EEPROM addresses can still occur while the copy
is in progress. The copy data command takes t EEC time
to execute, starting on the next falling edge after the
address is transmitted.
Recall Data [B8h, XX]. This command recalls the con-
tents of the EEPROM cells to the EEPROM shadow
memory for the EEPROM block containing address XX.
Lock [6Ah, XX]. This command locks (write protects)
the block of EEPROM memory containing memory
address XX. The lock bit in the EEPROM register must
be set to 1 before the lock command is executed. To
help prevent unintentional locks, one must issue the
lock command immediately after setting the lock bit
(EEPROM register, address 1Fh, bit 06) to a 1. If the
lock bit is 0 or if setting the lock bit to 1 does not imme-
diately precede the lock command, the lock command
has no effect. The lock command is permanent; a
locked block can never be written again.
Stand-Alone Fuel-Gauge IC with
LED Display Drivers
26 ______________________________________________________________________________________
Table 5. Function Commands
COMMAND DESCRIPTION
COMMAND
PROTOCOL
BUS STATE AFTER
COMMAND
PROTOCOL
BUS DATA
Read Data Reads data from memory starting at address XX. 69h, XX Master Rx
Up to 256
bytes of data
Write Data Writes data to memory starting at address XX. 6Ch, XX Master Tx
Up to 256
bytes of data
Copy Data
Copies shadow RAM data to EEPROM block containing
address XX.
48h, XX Master Reset None
Recall Data Recalls EEPROM block containing address XX to RAM. B8h, XX Master Reset None
Lock
Permanently locks the block of EEPROM
containing address XX.
6Ah, XX Master Reset None