ATTINY817-MFR. datasheet(48/492 Pages) MICROCHIP

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Figure 9-2. Flash Sections

FLASHSTART: 0x8000

BOOTEND>0: 0x8000+BOOTEND*256

BO OT

APPEND>0: 0x8000+APPEND*256

AP PL ICA TIO N

CO DE

AP PL ICA TIO N

DA TA

Section Sizes

The sizes of these sections are set by the Boot Section End fuse (FUSE.BOOTEND) and Application

Code Section End fuse (FUSE.APPEND).

The fuses select the section sizes in blocks of 256 bytes. As shown in Figure 9-2, the BOOT section

stretches from the start of the Flash until BOOTEND. The APPCODE section runs from BOOTEND until

APPEND. The remaining area is the APPDATA section. If APPEND is written to 0, the APPCODE section

runs from BOOTEND to the end of Flash (removing the APPDATA section). If BOOTEND and APPEND

are written to 0, the entire Flash is regarded as BOOT section. APPEND should either be set to 0 or a

value greater or equal than BOOTEND.

Table 9-2. Setting up Flash sections

BOOTEND APPEND

BOOT section

APPCODE section

APPDATA section

0 to FLASHEND

> 0

0 to 256*BOOTEND

256*BOOTEND to

FLASHEND

> 0

BOOTEND

0 to 256*BOOTEND

256*BOOTEND to

FLASHEND

> 0

BOOTEND

0 to 256*BOOTEND

256*BOOTEND to

256*APPEND

256*APPEND to

FLASHEND

Note:

•

Also see BOOTEND and APPEND descriptions.

•

Interrupt vectors are by default located after the BOOT section. This can be changed in the

interrupt controller. Refer to Interrupt Vector Locations

ATtiny417/817

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