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ATmega1284 Datasheet

8-bit Atmel Microcontroller

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ATmega1284 pdf
The 32 general purpose working registers, 64 I/O registers, 160 Extended I/O Registers and
the 1024/2048/4096 bytes of internal data SRAM in the Atmel
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P are all accessible through all these addressing
modes. The Register File is described in ”General Purpose Register File” on page 13.
Figure 8-2.
Data Memory Map for ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P.
Data Memory
32 Registers
64 I/O Registers
160 Ext I/O Reg.
0x0000 - 0x001F
0x0020 - 0x005F
0x0060 - 0x00FF
0x0100
Internal SRAM
(1024/2048/4096/16384x 8)
0x04FF/0x08FF/0x10FF /0x40FF
8.3.1
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 clkCPU cycles as described in Figure 8-3.
Figure 8-3.
On-chip data SRAM access cycles.
T1
T2
T3
clk
CPU
Address
Data
WR
Data
RD
Compute Address
Address valid
Memory Access Instruction
Next Instruction
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P [DATASHEET]
Atmel-8272G-AVR-01/2015
21
ATMEL Corporation
ATMEL Corporation


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