Datasheet

344
7766F–AVR–11/10
ATmega16/32U4
27.7.14 ATmega16U4/ATmega32U4 Boot Loader Parameters
In Table 27-8 through Table 27-10, the parameters used in the description of the Self-Program-
ming are given.
Note: 1. The different BOOTSZ Fuse configurations are shown in Figure 27-2
Note: 1. For details about these two section, see “NRWW – No Read-While-Write Section” on page
331 and “RWW – Read-While-Write Section” on page 331.
Table 27-8. Boot Size Configuration (Word Addresses)
(1)
Device
BOOTSZ1 BOOTSZ0
Boot Size
Pages Application Flash Section Boot Loader Flash Section End Application Section Boot Reset Address
(Start Boot Loader Section)
ATmega32U4
1 1 256 words 4 0x0000 - 0x3EFF 0x3F00 - 0x3FFF 0x3EFF 0x3F00
1 0 512 words 8 0x0000 - 0x3DFF 0x3E00 - 0x3FFF 0x3DFF 0x3E00
0 1 1024 words 16 0x0000 - 0x3BFF 0x3C00 - 0x3FFF 0x3BFF 0x3C00
0 0 2048 words 32 0x0000 - 0x37FF 0x3800 - 0x3FFF 0x37FF 0x3800
ATmega16U4
1 1 256 words 4 0x0000 - 0x1EFF 0x1F00 - 0x1FFF 0x1EFF 0x1F00
1 0 512 words 8 0x0000 - 0x1DFF 0x1E00 - 0x1FFF 0x1DFF 0x1E00
0 1 1024 words 16 0x0000 - 0x1BFF 0x1C00 - 0x1FFF 0x1BFF 0x1C00
0 0 2048 words 32 0x0000 - 0x17FF 0x1800 - 0x1FFF 0x17FF 0x1800
Table 27-9. Read-While-Write Limit (Word Addresses)
(1)
Device Section Pages Address
ATmega32U4
Read-While-Write section (RWW) 224 0x0000 - 0x37FF
No Read-While-Write section (NRWW) 32 0x3800 - 0x3FFF
ATmega16U4
Read-While-Write section (RWW) 97 0x0000 - 0x17FF
No Read-While-Write section (NRWW) 32 0x1800 - 0x1FFF