Rainbow Electronics ATmega128RFA1 - Manual (Page 491)

491
8266A-MCU Wireless-12/09
ATmega128RFA1
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Flash read using programming instruction 3a.
3. Load the page address using programming instructions 3c and 3d. PCWORD (refer
to Table 31-7 on page 467) is used to address within one page and must be written
as 0.
4. Enter JTAG instruction PROG_PAGEREAD.
5. 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.
6. Enter JTAG instruction PROG_COMMANDS.
7. Repeat steps 3 to 6 until all data have been read.
31.9.18 Programming the EEPROM
Before programming the EEPROM a Chip Erase must be performed, see "Performing
Chip Erase" on page 490.
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable EEPROM write using programming instruction 4a.
3. Load High byte of address using programming instruction 4b.
4. Load Low byte of address 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
WLRH
(refer to Table 31-14 on page 477).
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.
31.9.19 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.
31.9.20 Programming the Fuses
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Fuse write using programming instruction 6a.
3. Load data high byte using programming instructions 6b. A bit value of “0” will
program the corresponding fuse; a “1” will un-program the fuse.
4. Write Fuse High byte using programming instruction 6c.