ATmega325P datasheet(301/364 Pages) ATMEL

301 / 364 page

301

8023F–AVR–07/09

ATmega325P/3250P

25.8.15

Performing Chip Erase

Enter JTAG instruction PROG_COMMANDS.

Start Chip Erase using programming instruction 1a.

Poll for Chip Erase complete using programming instruction 1b, or wait for t

WLRH_CE (refer

to Table 25-13 on page 284).

25.8.16

Programming the Flash

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

on page 301.

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 25-13 on page 284).

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 25-11 on page 276) 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 Reg-

ister 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 25-13 on page 284).

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

25.8.17

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.

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