ATmega165 datasheet(276/336 Pages) ATMEL

276 / 336 page

276

ATmega165/V

2573G–AVR–07/09

Programming the Flash

Before programming the Flash a Chip Erase must be performed, see “Performing Chip

Erase” on page 275.

Enter JTAG instruction PROG_COMMANDS.

Enable Flash write using programming instruction 2a.

Load address High byte using programming instruction 2b.

Load address Low byte using programming instruction 2c.

Load data using programming instructions 2d, 2e and 2f.

Repeat steps 4 and 5 for all instruction words in the page.

Write the page using programming instruction 2g.

Poll for Flash write complete using programming instruction 2h, or wait for t

WLRH

(refer to Table 112 on page 259).

Repeat steps 3 to 7 until all data have been programmed.

A more efficient data transfer can be achieved using the PROG_PAGELOAD

instruction:

Enter JTAG instruction PROG_COMMANDS.

Enable Flash write using programming instruction 2a.

Load the page address using programming instructions 2b and 2c. PCWORD

(refer to Table 105 on page 249) is used to address within one page and must be

written as 0.

Enter JTAG instruction PROG_PAGELOAD.

Load the entire page by shifting in all instruction words in the page byte-by-byte,

starting with the LSB of the first instruction in the page and ending with the MSB

of the last instruction in the page. Use Update-DR to copy the contents of the

Flash Data Byte Register into the Flash page location and to auto-increment the

Program Counter before each new word.

Enter JTAG instruction PROG_COMMANDS.

Write the page using programming instruction 2g.

Poll for Flash write complete using programming instruction 2h, or wait for t

WLRH

(refer to Table 112 on page 259).

Repeat steps 3 to 8 until all data have been programmed.

Reading the Flash

Enter JTAG instruction PROG_COMMANDS.

Enable Flash read using programming instruction 3a.

Load address using programming instructions 3b and 3c.

Read data using programming instruction 3d.

Repeat steps 3 and 4 until all data have been read.

A more efficient data transfer can be achieved using the PROG_PAGEREAD

instruction:

Enter JTAG instruction PROG_COMMANDS.

Enable Flash read using programming instruction 3a.

Load the page address using programming instructions 3b and 3c. PCWORD

(refer to Table 105 on page 249) is used to address within one page and must be

written as 0.

Enter JTAG instruction PROG_PAGEREAD.

Read the entire page (or Flash) by shifting out all instruction words in the page

(or Flash), starting with the LSB of the first instruction in the page (Flash) and

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