Datasheet

43
XMEGA B [DATASHEET]
8291B–AVR–01/2013
4.18.3 DEVID2 – Device ID register 2
 Bit 7:0 – DEVID2[7:0]: Device ID Byte 2
Byte 2 of the device ID indicates the device number.
4.18.4 REVID – Revision ID
 Bit 7:4 – Reserved
These bits are unused and reserved for future use.
 Bit 3:0 – REVID[3:0]: Revision ID
These bits contains the device revision. 0 = A, 1 = B, and so on.
4.18.5 JTAGUID – JTAG User ID register
 Bit 7:0 – JTAGUID[7:0]: JTAG User ID
The JTAGUID can be used to identify two devices with identical device IDs in a JTAG scan chain. The JTAGUID will
automatically be loaded from flash during reset and placed in these registers.
4.18.6 MCUCR – MCU Control register
 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 – JTAGD: JTAG Disable
Setting this bit will disable the JTAG interface. This bit is protected by the configuration change protection mechanism.
For details, refer to “Configuration Change Protection” on page 14.
Bit 76543210
+0x02 DEVID2[7:0]
Read/Write R R R R R R R R
Initial Value 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0
Bit 76543210
+0x03
– – – – REVID[3:0]
Read/Write R R R R R R R R
Initial Value 0 0 0 0 1/0 1/0 1/0 1/0
Bit 76543210
+0x04 JTAGUID[7:0]
Read/Write R R R R R R R R
Initial Value 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0
Bit 76543210
+0x06
– – – – – – – JTAGD
Read/Write R R R R R R R R/W
Initial Value 0 0 0 0 0 0 0 0