ATmega165 datasheet(249/336 Pages) ATMEL

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249

ATmega165/V

2573G–AVR–07/09

The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are

locked if Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the

Lock bits.

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.

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 104.

Calibration Byte

The ATmega165 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.

Page Size

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 ATmega165. Pulses

are assumed to be at least 250 ns unless otherwise noted.

Signal Names

In this section, some pins of the ATmega165 are referenced by signal names describing

their functionality during parallel programming, see Figure 111 and Table 107. 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 109.

When pulsing WR or OE, the command loaded determines the action executed. The dif-

ferent Commands are shown in Table 110.

Table 104. Device and JTAG ID

Part

Signature Bytes Address

JTAG

0x000

0x001

0x002

Part Number

Manufacture ID

ATmega165

0x1E

0x94

0x05

9405

0x1F

Table 105. 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 106. 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]

ATmega165 Datasheet(PDF) 249 Page - ATMEL Corporation

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