Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 306)

100

101

306

ATmega128(L)

2467B–09/01

Figure 150. Virtual Flash Page Load Register

Virtual Flash Page Read

The Virtual Flash Page Read register is a virtual scan chain with length equal to the

number of bits in one Flash page plus 8. Internally the shift register is 8 bit, and the data

are automatically transferred from the Flash data page byte by byte. The first 8 cycles

are used to transfer the first byte to the internal shift register, and the bits that are shifted

out during these 8 cycles should be ignored. Following this initialization, data are shifted

out starting with the LSB of the first instruction in the page and ending with the MSB of

the last instruction in the page. This provides an efficient way to read one full Flash page

to verify programming.

Figure 151. Virtual Flash Page Read Register

Programming Algorithm All references below of type “1a”, “1b”, and so on, refer to

Table 132.

TDI

TDO

Flash

EEPROM

Fuses

Lock Bits

STROBES

ADDRESS

State

machine

TDI

TDO

Flash

EEPROM

Fuses

Lock Bits

STROBES

ADDRESS

State

machine

1 2 ... 301 302 303 304 305 306 307 308 309 310 311 ... 330 331

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