Reading the flash, Atmega162/v – Rainbow Electronics ATmega162V User Manual
Page 260
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ATmega162/V
2513E–AVR–09/03
8.
Poll for Flash write complete using programming instruction 2h, or wait for
t
WLRH_FLASH
(refer to Table 108 on page 243).
9.
Repeat steps 3 to 7 until all data have been programmed.
A more efficient data transfer can be achieved using the PROG_PAGELOAD
instruction:
1.
Enter JTAG instruction PROG_COMMANDS.
2.
Enable Flash write using programming instruction 2a.
3.
Load the page address using programming instructions 2b and 2c. PCWORD
(refer to Table 106 on page 235) is used to address within one page and must be
written as 0.
4.
Enter JTAG instruction PROG_PAGELOAD.
5.
Load the entire page by shifting in 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.
6.
Enter JTAG instruction PROG_COMMANDS.
7.
Write the page using programming instruction 2g.
8.
Poll for Flash write complete using programming instruction 2h, or wait for
t
WLRH_FLASH
(refer to Table 108 on page 243).
9.
Repeat steps 3 to 8 until all data have been programmed.
Reading the Flash
1.
Enter JTAG instruction PROG_COMMANDS.
2.
Enable Flash read using programming instruction 3a.
3.
Load address using programming instructions 3b and 3c.
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 106 on page 235) 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 8 bits shifted out should be
ignored.
6.
Enter JTAG instruction PROG_COMMANDS.
7.
Repeat steps 3 to 6 until all data have been read.