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ATMEGA640 Arkusz danych(PDF) 21 Page - ATMEL Corporation

Numer części ATMEGA640
Szczegółowy opis  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Arkusz danych(HTML) 21 Page - ATMEL Corporation

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ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
all these addressing modes. The Register File is described in “General Purpose Regis-
ter File” on page 13.
Data Memory Access Times
This section describes the general access timing concepts for internal memory access.
The internal data SRAM access is performed in two clk
CPU cycles as described in Figure
12.
Figure 12. On-chip Data SRAM Access Cycles
Table 4. Data Memory Map
Address (HEX)
0 - 1F
32 Registers
20 - 5F
64 I/O Registers
60 - 1FF
416 External I/O Registers
200
Internal SRAM
(8192 x 8)
21FF
2200
External SRAM
(0 - 64K x 8)
FFFF
clk
WR
RD
Data
Data
Address
Address valid
T1
T2
T3
Compute Address
CPU
Memory Access Instruction
Next Instruction



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