DS2760

13

EEPROM REGISTER

The format of the EEPROM Register is shown in Figure 11. The function of each bit is described in

detail in the following paragraphs.

EEPROM REGISTER FORMAT Figure 11

Address 07

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

EEC

LOCK

X

X

X

X

BL1

BL0

EEC – EEPROM Copy Flag. A 1 in this read-only bit indicates that a Copy Data command is in

progress. While this bit is high, writes to EEPROM addresses are ignored. A 0 in this bit indicates that

data may be written to unlocked EEPROM blocks.

LOCK – EEPROM Lock Enable. When this bit is 0, the Lock command is ignored. Writing a 1 to this

bit enables the Lock command. After the Lock command is executed, the LOCK bit is reset to 0. The

factory default is 0.

BL1 – EEPROM Block 1 Lock Flag. A 1 in this read-only bit indicates that EEPROM Block 1

(addresses 30-3F) is locked (read-only) while a 0 indicates Block 1 is unlocked (read/write).

BL0 – EEPROM Block 0 Lock Flag. A 1 in this read-only bit indicates that EEPROM Block 0

(addresses 20-2F) is locked (read-only) while a 0 indicates Block 0 is unlocked (read/write).

X – Reserved bits.

SPECIAL FEATURE REGISTER

The format of the Special Feature Register is shown in Figure 12. The function of each bit is described in

detail in the following paragraphs.

SPECIAL FEATURE REGISTER FORMAT Figure 12

Address 08

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

PS

PIO

MSTR

X

X

X

X

X

PS – PS Pin Mirror. This read-only bit mirrors the state of the PS pin. The reading of a 0 in this bit

should be immediately followed by writing a 1 to this location to insure proper operation.

PIO – PIO Pin Sense and Control. See the Programmable I/O section for details on this read/write bit.

MSTR - SWAP Master Status Bit. This bit indicates whether a device has been selected through the

SWAP command. Selection of this device through the SWAP command and the appropriate Net Address

will result in setting this bit, indicating that this device is the master. A 0 signifies that this device is not

the master.

X – Reserved bits.