
532
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
31.10.12 Programming Algorithm
31.10.13 Entering Programming Mode
7. Enter JTAG instruction AVR_RESET and shift 1 in the Reset Register.
8. Enter instruction PROG_ENABLE and shift 0b1010_0011_0111_0000 in the
Programming Enable Register.
31.10.14 Leaving Programming Mode
1. Enter JTAG instruction PROG_COMMANDS.
2. Disable all programming instructions by using no operation instruction 11a.
3. Enter instruction PROG_ENABLE and shift 0b0000_0000_0000_0000 in the
programming Enable Register.
4. Enter JTAG instruction AVR_RESET and shift 0 in the Reset Register.
31.10.15 Performing Chip Erase
1. Enter JTAG instruction PROG_COMMANDS.
2. Start Chip Erase using programming instruction 1a.
3. Poll for Chip Erase complete using programming instruction 1b, or wait for tWLRH_CE
31.10.16 Programming the Flash
Before programming the Flash a Chip Erase must be performed, see section
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Flash write using programming instruction 2a.
3. Load Extended High byte of address using programming instruction 2b.
4. Load High byte of address using programming instruction 2c.
5. Load Low byte of address using programming instruction 2d.
6. Load data using programming instructions 2e, 2f and 2g.
7. Repeat steps 5 and 6 for all instruction words in the page.
8. Write the page using programming instruction 2h.
9. Poll for Flash write complete using programming instruction 2i, or wait for tWLRH (refer
10.Repeat steps 4 to 9 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, 2c and 2d. PCWORD
written as 0.
4. Enter JTAG instruction PROG_PAGELOAD.
5. 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