ATMEGA640 datasheet(328/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

30.3 Signature Bytes

The microcontrollers have a three-byte signature code which identifies the device. This code can be read in both

serial and parallel mode, also when the device is locked. The three bytes reside in a separate address space. For

the ATmega640/1280/1281/2560/2561 the signature bytes are given in Table 30-6.

30.4 Calibration Byte

The ATmega640/1280/1281/2560/2561 has a byte calibration value for the internal RC Oscillator. This byte resides

in the high byte of address 0x000 in the signature address space. During reset, this byte is automatically written

into the OSCCAL Register to ensure correct frequency of the calibrated RC Oscillator.

30.5 Page Size

30.6 Parallel Programming Parameters, Pin Mapping, and Commands

This section describes how to parallel program and verify Flash Program memory, EEPROM Data memory, Mem-

ory Lock bits, and Fuse bits in the ATmega640/1280/1281/2560/2561. Pulses are assumed to be at least 250ns

unless otherwise noted.

30.6.1

Signal Names

In this section, some pins of the ATmega640/1280/1281/2560/2561 are referenced by signal names describing

their functionality during parallel programming, see Figure 30-1 and Table 30-9 on page 329. Pins not described in

the following table are referenced by pin names.

The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse. The bit coding is

shown in Table 30-12 on page 330.

When pulsing WR or OE, the command loaded determines the action executed. The different commands are

shown in Table 30-13 on page 330.

Table 30-6.

Device and JTAG ID

Part

Signature Bytes Address

JTAG

0x000

0x001

0x002

Part Number

Manufacture ID

ATmega640

0x1E

0x96

0x08

9608

0x1F

ATmega1280

0x1E

0x97

0x03

9703

0x1F

ATmega1281

0x1E

0x97

0x04

9704

0x1F

ATmega2560

0x1E

0x98

0x01

9801

0x1F

ATmega2561

0x1E

0x98

0x02

9802

0x1F

Table 30-7.

No. of Words in a Page and No. of Pages in the Flash

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

128K words (256Kbytes)

128 words

PC[6:0]

1024

PC[16:7]

Table 30-8.

No. of Words in a Page and No. of Pages in the EEPROM

EEPROM Size

Page Size

PCWORD

No. of Pages

PCPAGE

EEAMSB

4Kbytes

8 bytes

EEA[2:0]

512

EEA[11:3]

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