
302
ATmega64A [DATASHEET]
8160D–AVR–02/2013
4.
Read data using programming instruction 3d.
5.
Repeat steps 3 and 4 until all data have been read.
A more efficient data transfer can be achieved using the PROG_PAGEREAD instruction:
1.
Enter JTAG instruction PROG_COMMANDS.
2.
Enable Flash read using programming instruction 3a.
3.
Load the page address using programming instructions 3b and 3c. PCWORD (refer to
Table 28-9 on page278) is used to address within one page and must be written as 0.
4.
Enter JTAG instruction PROG_PAGEREAD.
5.
Read the entire page by shifting out all instruction words in the page, starting with the LSB of the first
instruction in the page and ending with the MSB of the last instruction in the page. Remember that the first
eight bits shifted out should be ignored.
6.
Enter JTAG instruction PROG_COMMANDS.
7.
Repeat steps 3 to 6 until all data have been read.
28.9.19
Programming the EEPROM
1.
Enter JTAG instruction PROG_COMMANDS.
2.
Enable EEPROM write using programming instruction 4a.
3.
Load address high byte using programming instruction 4b.
4.
Load address low byte using programming instruction 4c.
5.
Load data using programming instructions 4d and 4e.
6.
Repeat steps 4 and 5 for all data bytes in the page.
7.
Write the data using programming instruction 4f.
8.
Poll for EEPROM write complete using programming instruction 4g, or wait for t
9.
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.
28.9.20
Reading the EEPROM
1.
Enter JTAG instruction PROG_COMMANDS.
2.
Enable EEPROM read using programming instruction 5a.
3.
Load address using programming instructions 5b and 5c.
4.
Read data using programming instruction 5d.
5.
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
28.9.21
Programming the Fuses
1.
Enter JTAG instruction PROG_COMMANDS.
2.
Enable Fuse write using programming instruction 6a.
3.
Load data Low byte using programming instructions 6b. A bit value of “0” will program the corresponding
fuse, a “1” will unprogram the fuse.
4.
Write Fuse Extended byte using programming instruction 6c.
5.
Poll for Fuse write complete using programming instruction 6d, or wait for t
6.
Load data Low byte using programming instructions 6e. A bit value of “0” will program the corresponding
fuse, a “1” will unprogram the fuse.