Datasheet

255
2490R–AVR–02/2013
ATmega64(L)
controller state. The Bypass Register can be used to shorten the scan chain on a system when
the other devices are to be tested.
Device Identification
Register
Figure 125 shows the structure of the Device Identification Register.
Figure 125. The Format of the Device Identification Register
Version Version is a 4-bit number identifying the revision of the component. The JTAG version number
follows the revision of the device. Revision A is 0x0, revision B is 0x1 and so on.
Part Number The part number is a 16-bit code identifying the component. The JTAG Part Number for
ATmega64 is listed in Table 100.
Manufacturer ID The Manufacturer ID is a 11-bit code identifying the manufacturer. The JTAG manufacturer ID
for Atmel is listed in Table 101.
MSB
LSB
Bit
31 28 27 12 11 1 0
Device ID Version Part Number Manufacturer ID 1
4 bits 16 bits 11 bits 1-bit
Table 100. AVR JTAG Part Number
Part Number JTAG Part Number (Hex)
ATmega64 0x9602
Table 101. Manufacturer ID
Manufacturer JTAG Man. ID (Hex)
Atmel 0x01F