ATmega165 datasheet(275/336 Pages) ATMEL

275 / 336 page

275

ATmega165/V

2573G–AVR–07/09

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.

Figure 126. Flash Data Byte Register

The state machine controlling the Flash Data Byte Register is clocked by TCK. During

normal operation in which eight bits are shifted for each Flash byte, the clock cycles

needed to navigate through the TAP controller automatically feeds the state machine for

the Flash Data Byte Register with sufficient number of clock pulses to complete its oper-

ation transparently for the user. However, if too few bits are shifted between each

Update-DR state during page load, the TAP controller should stay in the Run-Test/Idle

state for some TCK cycles to ensure that there are at least 11 TCK cycles between each

Update-DR state.

Programming Algorithm

All references below of type “1a”, “1b”, and so on, refer to Table 115.

Entering Programming Mode

Enter JTAG instruction AVR_RESET and shift 1 in the Reset Register.

Enter instruction PROG_ENABLE and shift 0b1010_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 0b0000_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

WLRH_CE (refer to Table 112 on page 259).

TDI

TDO

Flash

EEPROM

Fuses

Lock Bits

STROBES

ADDRESS

State

Machine

ATmega165 Datasheet(PDF) 275 Page - ATMEL Corporation

ATmega165 Datasheet(HTML) 275 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL