ATmega162 datasheet(260/324 Pages) ATMEL

260 / 324 page

260

2513K–AVR–07/09

ATmega162/V

Figure 112. Virtual Flash Page Read Register

Programming

Algorithm

All references below of type “1a”, “1b”, and so on, refer to Table 111.

Entering Programming

Mode

Enter JTAG instruction AVR_RESET and shift one in the Reset Register.

Enter instruction PROG_ENABLE and shift 1010_0011_0111_0000 in the Programming

Enable Register.

Leaving Programming

Mode

Enter JTAG instruction PROG_COMMANDS.

Disable all programming instructions by using no operation instruction 11a.

Enter instruction PROG_ENABLE and shift 0000_0000_0000_0000 in the Programming

Enable Register.

Enter JTAG instruction AVR_RESET and shift 0 in the Reset Register.

Performing Chip Erase

Enter JTAG instruction PROG_COMMANDS.

Start Chip Erase using programming instruction 1a.

Poll for Chip Erase complete using programming instruction 1b, or wait for t

WLRH_CE (refer

to Table 107 on page 244).

Programming the

Flash

Before programming the Flash a Chip Erase must be performed. See “Performing Chip Erase”

on page 260.

Enter JTAG instruction PROG_COMMANDS.

Enable Flash write using programming instruction 2a.

Load address high byte using programming instruction 2b.

Load address low byte using programming instruction 2c.

Load data using programming instructions 2d, 2e and 2f.

Repeat steps 4 and 5 for all instruction words in the page.

TDI

TDO

Flash

EEPROM

Fuses

Lock Bits

STROBES

ADDRESS

State

Machine

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