Atmel XMEGA B, User Manual

Page: 27 / 415

27 XMEGA B [DATASHEET]
8291B–AVR–01/2013
4.14.5 DATA1 – Data register 1

Bit 7:0 – DATA[15:8]: Data Register Byte 1
This register gives the data value byte 1 when accessing NVM locations.
4.14.6 DATA2 – Data register 2

Bit 7:0 – DATA[23:16]: Data Register Byte 2
This register gives the data value byte 2 when accessing NVM locations.
4.14.7 CMD – Command register

Bit 7 – Reserved
This bit is unused and reserved for future use. For compatibility with future devices, always write this bit to zero when this
register is written.

Bit 6:0 -CMD[6:0]: Command
These bits define the programming commands for the flash. Bit 6 is only set for external programming commands. See
“Memory Programming” on page 385 ” for programming commands.
4.14.8 CTRLA – Control register A

Bit 7:1 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.
 Bit 0 – CMDEX: Command Execute
Setting this bit will execute the command in the CMD register. This bit is protected by the configuration change protection
(CCP) mechanism. Refer to
“Configuration Change Protection” on page 14 for details on the CCP.
Bit 7 6 5 4 3 2 1 0
+0x05
DATA[15:8]
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
+0x06
DATA[23:16]
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
+0x0A
– CMD[6:0]
Read/Write R R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
+0x0B
– – – – – – – CMDEX
Read/Write R R R R R R R S
Initial Value 0 0 0 0 0 0 0 0