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參數(shù)資料
| 型號： | R83C154DTXXX-25D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁數(shù)： | 13/108頁 |
| 文件大?。?/td> | 3682K |
| 代理商： | R83C154DTXXX-25D |
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12
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
7.4
Data Memory
The Data Memory consist of the I/O Memory, EEPROM and SRAM memories, all within one lin-
ear address space, see Figure 7-2 on page 12. To simplify development, the memory map for all
devices in the family is identical and with empty, reserved memory space for smaller devices.
7.4.1
I/O Memory
All peripherals and modules are addressable through I/O memory locations in the data memory
space. All I/O memory locations can be accessed by the Load (LD/LDS/LDD) and Store
(ST/STS/STD) instructions, transferring data between the 32 general purpose registers in the
CPU and the I/O Memory.
The IN and OUT instructions can address I/O memory locations in the range 0x00 - 0x3F
directly.
I/O registers within the address range 0x00 - 0x1F are directly bit-accessible using the SBI and
CBI instructions. The value of single bits can be checked by using the SBIS and SBIC instruc-
tions on these registers.
The I/O memory address for all peripherals and modules in XMEGA A4 is shown in the ”Periph-
7.4.2
SRAM Data Memory
The XMEGA A4 devices have internal SRAM memory for data storage.
Figure 7-2.
Data Memory Map (Hexadecimal address)
Byte Address
ATxmega64A4
Byte Address
ATxmega32A4
Byte Address
ATxmega16A4
0
I/O Registers
(4 KB)
0
I/O Registers
(4 KB)
0
I/O Registers
(4 KB)
FFF
1000
EEPROM
(2 KB)
1000
EEPROM
(1 KB)
1000
EEPROM
(1 KB)
17FF
13FF
RESERVED
2000
Internal SRAM
(4 KB)
2000
Internal SRAM
(4 KB)
2000
Internal SRAM
(2 KB)
2FFF
27FF
Byte Address
ATxmega128A4
0
I/O Registers
(4 KB)
FFF
1000
EEPROM
(2 KB)
17FF
RESERVED
2000
Internal SRAM
(8 KB)
3FFF
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