ATmega16 datasheet(229/357 Pages) ATMEL

229 / 357 page

229

2466S–AVR–05/09

ATmega16(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

Figure 114 shows the structure of the Device Identification Register.

Figure 114. 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. However, some

revisions deviate from this rule, and the relevant version number is shown in Table 87.

Part Number

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

ATmega16 is listed in Table 88.

Manufacturer ID

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

for ATMEL is listed in Table 89.

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 set-

tings for the clock options, the part will remain reset for a Reset Time-Out Period (refer to “Clock

Sources” on page 25) 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 115.

MSB

LSB

Bit

271211

Device ID

Version

Part Number

Manufacturer ID

4 bits

16 bits

11 bits

1 bit

Table 87. JTAG Version Numbers

Version

JTAG Version Number (Hex)

ATmega16 revision G

0x6

ATmega16 revision H

0xE

ATmega16 revision I

0x8

ATmega16 revision J

0x9

ATmega16 revision K

0xA

ATmega16 revision L

0xB

Table 88. AVR JTAG Part Number

Part Number

JTAG Part Number (Hex)

ATmega16

0x9403

Table 89. Manufacturer ID

Manufacturer

JTAG Manufacturer ID (Hex)

ATMEL

0x01F

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