ATmega324P datasheet(326/377 Pages) ATMEL

326 / 377 page

326

7674F–AVR–09/09

ATmega164P/324P/644P

25.10.17 Reading the Flash

Enter JTAG instruction PROG_COMMANDS.

Enable Flash read using programming instruction 3a.

Load address using programming instructions 3b, 3c and 3d.

Read data using programming instruction 3e.

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, 3c and 3d. PCWORD (refer

to Table 25-7 on page 299) 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 ending with the MSB

of the last instruction in the page (Flash). The Capture-DR state both captures the data

from the Flash, and also auto-increments the program counter after each word is read.

Note that Capture-DR comes before the shift-DR state. Hence, the first byte which is

shifted out contains valid data.

Enter JTAG instruction PROG_COMMANDS.

Repeat steps 3 to 6 until all data have been read.

25.10.18 Programming the EEPROM

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

Erase” on page 325.

Enter JTAG instruction PROG_COMMANDS.

Enable EEPROM write using programming instruction 4a.

Load address High byte using programming instruction 4b.

Load address Low byte using programming instruction 4c.

Load data using programming instructions 4d and 4e.

Repeat steps 4 and 5 for all data bytes in the page.

Write the data using programming instruction 4f.

Poll for EEPROM write complete using programming instruction 4g, or wait for t

WLRH

(refer to Table 25-14 on page 309).

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

Note that the PROG_PAGELOAD instruction can not be used when programming the EEPROM.

25.10.19 Reading the EEPROM

Enter JTAG instruction PROG_COMMANDS.

Enable EEPROM read using programming instruction 5a.

Load address using programming instructions 5b and 5c.

Read data using programming instruction 5d.

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

Note that the PROG_PAGEREAD instruction can not be used when reading the EEPROM.

ATmega324P Datasheet(PDF) 326 Page - ATMEL Corporation

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