ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 255

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Bypass Register
Device Identification Register
Version
Part Number
Manufacturer ID
2490G–AVR–03/04
The Bypass Register consists of a single Shift Register stage. When the Bypass Regis-
ter is selected as path between TDI and TDO, the register is reset to 0 when leaving the
Capture-DR controller state. The Bypass Register can be used to shorten the scan
chain on a system when the other devices are to be tested.
Figure 125 shows the structure of the Device Identification Register.
Figure 125. The Format of the Device Identification Register
Version is a 4-bit number identifying the revision of the component. The relevant version
number is shown in Table 100.
Table 100. JTAG Version Numbers
The part number is a 16-bit code identifying the component. The JTAG Part Number for
ATmega64 is listed in Table 101.
Table 101. AVR JTAG Part Number
The Manufacturer ID is a 11-bit code identifying the manufacturer. The JTAG manufac-
turer ID for Atmel is listed in Table 102.
Table 102. Manufacturer ID
Bit
Device ID
Version
ATmega64 Revision A
Part Number
ATmega64
Manufacturer
Atmel
MSB
31
Version
4 bits
28
27
Part Number
16 bits
12
JTAG Part Number (Hex)
JTAG Version Number (Hex)
11
JTAG Man. ID (Hex)
0x9602
Manufacturer ID
0x01F
11 bits
0x0
ATmega64(L)
1
LSB
1-bit
1
0
255