Bypass register, Device identification register, Version – Rainbow Electronics Atmega169L User Manual

Page 232: Part number, Manufacturer id, Atmega169v/l

232

ATmega169V/L

2514A–AVR–08/02

Bypass Register

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.

Device Identification Register

Figure 106 shows the structure of the Device Identification Register.

Figure 106. The Format of the Device Identification Register

Version

Version is a 4-bit number identifying the revision of the component. The relevant version
number is shown in Table 100.

Part Number

The part number is a 16-bit code identifying the component. The JTAG Part Number for
ATmega169 is listed in Table 101.

Manufacturer ID

The Manufacturer ID is a 11-bit code identifying the manufacturer. The JTAG manufac-
turer ID for ATMEL is listed in Table 102.

MSB

LSB

Bit

Device ID

Version

Part Number

Manufacturer ID

4 bits

16 bits

11 bits

1-bit

Table 100. JTAG Version Numbers

Version

JTAG Version Number (Hex)

ATmega169 revision A

0x0

Table 101. AVR JTAG Part Number

Part Number

JTAG Part Number (Hex)

ATmega169

0x9405

Table 102. Manufacturer ID

Manufacturer

JTAG Manufactor ID (Hex)

ATMEL

0x01F