ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 345

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Latching of Fuses
Signature Bytes
Calibration Byte
Page Size
Parallel Programming Parameters, Pin Mapping, and Commands
Signal Names
2549K–AVR–01/07
The fuse values are latched when the device enters programming mode and changes of
the fuse values will have no effect until the part leaves Programming mode. This does
not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses
are also latched on Power-up in Normal mode.
All Atmel 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.
T h e t h r e e b y t e s r e s i d e i n a s e p a r a t e a d d r e s s s p a c e . F o r t h e
ATmega640/1280/1281/2560/2561 the signature bytes are given in Table 154.
Table 154. Device and JTAG ID
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.
Table 155. No. of Words in a Page and No. of Pages in the Flash
Table 156. No. of Words in a Page and No. of Pages in the EEPROM
This section describes how to parallel program and verify Flash Program memory,
E E P R O M D a t a m e m o r y , M e m o r y L o c k b i t s , a n d F u s e b i t s i n t h e
ATmega640/1280/1281/2560/2561. Pulses are assumed to be at least 250 ns unless
otherwise noted.
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 138
and Table 157. 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 posi-
tive pulse. The bit coding is shown in Table 160.
Part
ATmega640
ATmega1280
ATmega1281
ATmega2560
ATmega2561
128K words (256K bytes)
EEPROM Size
Flash Size
4K bytes
0x000
0x1E
0x1E
0x1E
0x1E
0x1E
Signature Bytes Address
ATmega640/1280/1281/2560/2561
Page Size
128 words
Page Size
8 bytes
0x001
0x96
0x97
0x97
0x98
0x98
PCWORD
PCWORD
EEA[2:0]
PC[6:0]
0x002
0x08
0x03
0x04
0x01
0x02
Part Number
Pages
Pages
No. of
No. of
1024
512
9608
9703
9704
9801
9802
EEA[11:3]
PCPAGE
PCPAGE
PC[16:7]
JTAG
Manufacture ID
0x1F
0x1F
0x1F
0x1F
0x1F
EEAMSB
PCMSB
16
11
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