ATmega165 datasheet(268/336 Pages) ATMEL

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268

ATmega165/V

2573G–AVR–07/09

PROG_COMMANDS (0x5)

The AVR specific public JTAG instruction for entering programming commands via the

JTAG port. The 15-bit Programming Command Register is selected as Data Register.

The active states are the following:

•

Capture-DR: The result of the previous command is loaded into the Data Register.

•

Shift-DR: The Data Register is shifted by the TCK input, shifting out the result of the

previous command and shifting in the new command.

•

Update-DR: The programming command is applied to the Flash inputs

•

Run-Test/Idle: One clock cycle is generated, executing the applied command (not

always required, see Table 115 below).

PROG_PAGELOAD (0x6)

The AVR specific public JTAG instruction to directly load the Flash data page via the

JTAG port. An 8-bit Flash Data Byte Register is selected as the Data Register. This is

physically the 8 LSBs of the Programming Command Register. The active states are the

following:

•

Shift-DR: The Flash Data Byte Register is shifted by the TCK input.

•

Update-DR: The content of the Flash Data Byte Register is copied into a temporary

the temporary register into the Flash page buffer. The AVR automatically alternates

between writing the low and the high byte for each new Update-DR state, starting

with the low byte for the first Update-DR encountered after entering the

PROG_PAGELOAD command. The Program Counter is pre-incremented before

writing the low byte, except for the first written byte. This ensures that the first data is

written to the address set up by PROG_COMMANDS, and loading the last location

in the page buffer does not make the program counter increment into the next page.

PROG_PAGEREAD (0x7)

The AVR specific public JTAG instruction to directly capture the Flash content via the

JTAG port. An 8-bit Flash Data Byte Register is selected as the Data Register. This is

physically the 8 LSBs of the Programming Command Register. The active states are the

following:

•

Capture-DR: The content of the selected Flash byte is captured into the Flash Data

Byte Register. The AVR automatically alternates between reading the low and the

high byte for each new Capture-DR state, starting with the low byte for the first

Capture-DR encountered after entering the PROG_PAGEREAD command. The

Program Counter is post-incremented after reading each high byte, including the

first read byte. This ensures that the first data is captured from the first address set

up by PROG_COMMANDS, and reading the last location in the page makes the

program counter increment into the next page.

•

Shift-DR: The Flash Data Byte Register is shifted by the TCK input.

Data Registers

The Data Registers are selected by the JTAG instruction registers described in section

“Programming Specific JTAG Instructions” on page 266. The Data Registers relevant for

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