ATMEGA32_14 Datasheet, PDF (226/346 Pages) ATMEL Corporation – High Endurance Non-volatile Memory segments

ATmega32(L)
Device Identification
Register
Version
Part Number
Manufacturer ID
Reset Register
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 114 shows the structure of the Device Identification Register.
Figure 114. The Format of the Device Identification Register
Bit
Device ID
MSB
31
28 27
12 11
Version
Part Number
4 bits
16 bits
Manufacturer ID
11 bits
LSB
1
0
1
1 bit
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 x1 and so on.
The part number is a 16-bit code identifying the component. The JTAG Part Number for
ATmega32 is listed in Table 87.
Table 87. AVR JTAG Part Number
Part Number
ATmega32
JTAG Part Number (Hex)
0x9502
The Manufacturer ID is a 11 bit code identifying the manufacturer. The JTAG manufacturer ID
for Atmel is listed in Table 88.
Table 88. Manufacturer ID
Manufacturer
Atmel
JTAG Man. ID (Hex)
0x01F
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.
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