atxmega128a4-mu ATMEL Corporation, atxmega128a4-mu Datasheet - Page 9

• Manufacturer Part Number: atxmega128a4-mu
• Description: Atxmega16a4 8/16-bit Avr Xmega Microcontroller
• Manufacturer: ATMEL Corporation

7.6
8069A–AVR–02/08
I/O Memory
All XMEGA A4 I/Os and peripherals are addressable through I/O memory locations in the data
memory space. All I/O locations may be accessed by the LD/LDS/LDD and ST/STS/STD
instructions, transferring data between the 32 general purpose registers and the I/O memory.
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 in these registers.
The I/O space definition of the XMEGA A4 is shown in
page
48.
”Peripheral Module Address Map” on
Byte Address
FFFFFF
3FFF
17FF
1000
2000
4000
FFF
ATxmega A4
0
External Memory
ATxmega64A4
Internal SRAM
I/O Registers
(0 to 16 MB)
RESERVED
EEPROM
(4KB)
(2K)
(8K)
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