ATmega169P datasheet(298/393 Pages) ATMEL

298 / 393 page

298

8018N–AVR–08/09

ATmega169P

27.2.1

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.

27.3

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. The signature bytes are given in Table 27-6.

27.4

Calibration Byte

The ATmega169P 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.

27.5

Page Size

27.6

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 ATmega169P. Pulses are assumed to be

at least 250 ns unless otherwise noted.

27.6.1

Signal Names

In this section, some pins of the ATmega169P are referenced by signal names describing their

functionality during parallel programming, see Figure 27-1 and Table 27-9. 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 27-11.

Table 27-6.

Device and JTAG ID

Part

Signature Bytes Address

JTAG

0x000

0x001

0x002

Part Number

Manufacture ID

ATmega169P

0x1E

0x94

0x05

9405

0x1F

Table 27-7.

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

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

8K words (16K bytes)

64 words

PC[5:0]

128

PC[12:6]

Table 27-8.

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

EEPROM Size

Page Size

PCWORD

No. of Pages

PCPAGE

EEAMSB

512 bytes

4 bytes

EEA[1:0]

128

EEA[8:2]

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