AT90USB1287-AU(2012) 데이터 시트보기 (PDF) - Atmel Corporation
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AT90USB1287-AU
(Rev.:2012)
(Rev.:2012)
Atmel Corporation
AT90USB1287-AU Datasheet PDF : 456 Pages
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6. Atmel AVR AT90USB64/128 memories
This section describes the different memories in the AT90USB64/128. The AVR architecture has
two main memory spaces, the Data Memory and the Program Memory space. In addition, the
AT90USB64/128 features an EEPROM Memory for data storage. All three memory spaces are
linear and regular.
Table 6-1.
Memory
Flash
Memory mapping.
Size
Start address
Mnemonic
Flash size
-
End address
Flash end
32 registers
I/O registers
Ext I/O
registers
Internal
SRAM
External
Memory
EEPROM
Size
Start address
End address
Size
Start address
End address
Size
Start address
End address
Size
Start address
End address
Size
Start address
End address
Size
Start address
End address
-
-
-
-
-
-
-
-
-
ISRAM size
ISRAM start
ISRAM end
XMem size
XMem start
XMem end
E2 size
-
E2 end
AT90USB64
64Kbytes
0x00000
0x0FFFF (1)
0x7FFF (2)
32bytes
0x0000
0x001F
64 bytes
0x0020
0x005F
160bytes
0x0060
0x00FF
4Kbytes
0x0100
0x10FF
0-64Kbytes
0x1100
0xFFFF
2Kbytes
0x0000
0x07FF
AT90USB128
128K bytes
0x1FFFF (1)
0xFFFF (2)
8Kbytes
0x20FF
0x2100
4Kbytes
0x0FFF
Notes: 1. Byte address.
2. Word (16-bit) address.
6.1 In-system re-programmable flash program memory
The AT90USB64/128 contains 128Kbytes On-chip In-System Re-programmable Flash memory
for program storage. Since all AVR instructions are 16 or 32 bits wide, the Flash is organized as
64K × 16. For software security, the Flash Program memory space is divided into two sections,
Boot Program section and Application Program section.
The Flash memory has an endurance of at least 100,000 write/erase cycles. The
AT90USB64/128 Program Counter (PC) is 16 bits wide, thus addressing the 128K program
memory locations. The operation of Boot Program section and associated Boot Lock bits for
20 AT90USB64/128
7593L–AVR–09/12
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