A000047 Arduino, A000047 Datasheet - Page 303

• Manufacturer Part Number: A000047
• Description: MCU, MPU & DSP Development Tools Mega2560
• Manufacturer: Arduino
• Series: -r
• Type: MCUr

Specifications of A000047

• Processor To Be Evaluated: ATmega2560
• Interface Type: USB, I2C, SPI
• Dimensions: 4 in x 2.1 in
• Operating Supply Voltage: 5 V
• Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ATmega2560

27.3.1
27.3.2
27.3.2.1
27.3.2.2
27.3.2.3
27.3.3
2549M–AVR–09/10
Bypass Register
Device Identification Register
Reset Register
Version
Part Number
Manufacturer ID
The Bypass Register consists of a single Shift Register stage. When the Bypass Register 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 27-1
Figure 27-1. The Format of the Device Identification Register
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.
The part number is a 16-bit code identifying the component. The JTAG Part Number for
ATmega640/1280/1281/2560/2561 is listed in
The Manufacturer ID is a 11-bit code identifying the manufacturer. The JTAG manufacturer ID
for ATMEL is listed in
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 (see
Sources” on page
not latched, so the reset will take place immediately, as shown in
Bit
Device ID
shows the structure of the Device Identification Register.
MSB
31
Version
4 bits
41) after releasing the Reset Register. The output from this Data Register is
Table 29-6 on page
28
27
ATmega640/1280/1281/2560/2561
Part Number
16 bits
338.
Table 29-6 on page
12
11
Figure 27-2 on page
338.
Manufacturer ID
11 bits
1
304.
1-bit
LSB
“Clock
1
0
303