Datasheet

878
32142D–06/2013
ATUC64/128/256L3/4U
34.5.4 JTAG Data Registers
The following device specific registers can be selected as JTAG scan chain depending on the
instruction loaded in the JTAG Instruction Register. Additional registers exist, but are implicitly
described in the functional description of the relevant instructions.
34.5.4.1 Device Identification Register
The Device Identification Register contains a unique identifier for each product. The register is
selected by the IDCODE instruction, which is the default instruction after a JTAG reset.
Device specific ID codes
The different device configurations have different JTAG ID codes, as shown in Table 34-28.
Note that if the flash controller is statically reset, the ID code will be undefined
.
34.5.4.2 Reset Register
The reset register is selected by the AVR_RESET instruction and contains one bit for each reset
domain in the device. Setting each bit to one will keep that domain reset until the bit is cleared.
MSB LSB
Bit 31 28 27 12 11 1 0
Device ID Revision Part Number Manufacturer ID 1
4 bits 16 bits 11 bits 1 bit
Revision
This is a 4 bit number identifying the revision of the component.
Rev A = 0x0, B = 0x1, etc.
Part Number
The part number is a 16 bit code identifying the component.
Manufacturer ID
The Manufacturer ID is a 11 bit code identifying the manufacturer.
The JTAG manufacturer ID for ATMEL is 0x01F.
Table 34-28. Device and JTAG ID
Device Name JTAG ID Code (R is the revision number)
ATUC256L3U 0xr21C303F
ATUC128L3U 0xr21C403F
ATUC64L3U 0xr21C503F
ATUC256L4U 0xr21C603F
ATUC128L4U 0xr21C703F
ATUC64L4U 0xr21C803F
Bit 0
Reset
domain System