ATmega1284P datasheet(294/380 Pages) ATMEL

294 / 380 page

294

8059D–AVR–11/09

ATmega1284P

25.2.1

Latching of Fuses

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.

25.3

Signature Bytes

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. The three

bytes reside in a separate address space. For the ATmega1284P the signature bytes are given

in Table 25-6.

25.4

Calibration Byte

The ATmega1284P 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 auto-

matically written into the OSCCAL Register to ensure correct frequency of the calibrated RC

Oscillator.

25.5

Page Size

25.6

Parallel Programming Parameters, Pin Mapping, and Commands

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

Data memory, Memory Lock bits, and Fuse bits in the ATmega1284P. Pulses are assumed to be

at least 250 ns unless otherwise noted.

25.6.1

Signal Names

In this section, some pins of the ATmega1284P are referenced by signal names describing their

functionality during parallel programming, see Figure 25-1 on page 295 and Figure 25-9 on page

295. Pins not described in the following table are referenced by pin names.

Table 25-6.

Device and JTAG ID

Part

Signature Bytes Address

JTAG

0x000

0x001

0x002

Part Number

Manufacture ID

ATmega1284P

0x1E

0x97

0x05

9705

0x1F

Table 25-7.

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

Device

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

ATmega1284P

64K words (128 Kbytes)

128 words

PC[6:0]

512

PC[15:7]

Table 25-8.

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

Device

EEPROM Size

Page Size

PCWORD

No. of Pages

PCPAGE

EEAMSB

ATmega1284P

4 Kbytes

8 bytes

EEA[2:0]

512

EEA[11:3]

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