参数资料
型号: MB9AF311MPMC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP80
封装: 0.50 MM PITCH, PLASTIC, LQFP-80
文件页数: 24/114页
文件大小: 1357K
代理商: MB9AF311MPMC
17
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
Figure 8-2. Program Memory Map Atmel ATmega88PA, Atmel ATmega168PA
8.3
SRAM Data Memory
Figure 8-3 shows how the Atmel ATmega48PA/88PA/168PA SRAM memory is organized.
The Atmel ATmega48PA/88PA/168PA is a complex microcontroller with more peripheral units than can be supported within
the 64 locations reserved in the opcode for the IN and OUT instructions. For the extended I/O space from 0x60 - 0xFF in
SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
The lower 768/1280/1280/2303 data memory locations address both the register file, the I/O memory, extended I/O memory,
and the internal data SRAM. The first 32 locations address the register file, the next 64 location the standard I/O memory,
then 160 locations of extended I/O memory, and the next 512/1024/1024/2048 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, indirect with displacement, indirect, indirect with pre-
decrement, and indirect with post-increment. In the register file, registers R26 to R31 feature the indirect addressing pointer
registers.
The direct addressing reaches the entire data space.
The indirect with displacement mode reaches 63 address locations from the base address given by the Y- or Z-register.
When using register indirect addressing modes with automatic pre-decrement and post-increment, the address registers X,
Y, and Z are decremented or incremented.
The 32 general purpose working registers, 64 I/O registers, 160 extended I/O registers, and the 512/1024/1024/2048 bytes
of internal data SRAM in the Atmel ATmega48PA/88PA/168PA are all accessible through all these addressing modes. The
Figure 8-3. Data Memory Map
0x0000
0x3FFF/0x1FFF/0x3FFF
Boot Flash Section
Program Memory
Application Flash Section
32 Registers
Data Memory
0x0000 - 0x001F
0x0020 - 0x005F
0x0060 - 0x00FF
0x0100
0x02FF/0x04FF/0x4FF/0x08FF
64 I/O Registers
160 Ext I/O Registers
Internal SRAM
(512/1024/1024/2048 x 8)
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