Rainbow-electronics ATmega128L Manual de usuario descargar pdf (Pagina 245)

245

ATmega128(L)

2467B–09/01

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 121 shows the structure of the Device Identification register.

Figure 121. 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 99.

• Part Number

The part number is a 16 bit code identifying the component. The JTAG Part Number for

ATmega128 is listed in

Table 100.

• Manufacturer ID

The Manufacturer ID is a 11-bit code identifying the manufacturer. The JTAG manufac-

turer ID for ATMEL is listed in

Table 101.

Reset Register The Reset Register is a Test Data Register used to reset the part. Since the AVR tri-

states Port Pins when reset, the Reset Register can also replace the function of the

unimplemented optional JTAG instruction HIGHZ.

A high value in the Reset Register corresponds to pulling the external Reset low. The

part is reset as long as there is a high value present in the Reset Register. Depending

on the Fuse settings for the clock options, the part will remain reset for a Reset Time-

Out Period (refer to

“Clock Sources” on page 34) after releasing the Reset Register. The

output from this Data Register is not latched, so the reset will take place immediately, as

shown in

Figure 122.

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 99. JTAG Version Numbers

Version JTAG Version number (Hex)

ATmega128 revision C 0x3

Table 100. AVR JTAG Part Number

Part number JTAG Part Number (Hex)

ATmega128 0x9702

Table 101. Manufacturer ID

Manufacturer JTAG Man. ID (Hex)

ATME L 0x 01F

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 330 331

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