ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 43

• Manufacturer Part Number: ATA6613
• Description: Ata6613
• Manufacturer: ATMEL Corporation

6.5.2
9111C–AUTO–02/08
SRAM Data Memory
Figure 6-9
The ATA6612/ATA6613 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 data memory locations address both the Register File, the I/O mem-
ory, 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 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, Indirect with Displace-
ment, 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-incre-
ment, 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 bytes of internal data SRAM in the ATA6612/ATA6613 are all accessible
through all these addressing modes. The Register File is described in
ter File” on page
Figure 6-9.
shows how the ATA6612/ATA6613 SRAM Memory is organized.
Data Memory Map
36.
(512/1024/1024 x 8)
160 Ext I/O Reg.
64 I/O Registers
Internal SRAM
Data Memory
32 Registers
0x0000 - 0x001F
0x0020 - 0x005F
0x0060 - 0x00FF
0x0100
0x02FF/0x04FF/0x04FF
ATA6612/ATA6613
“General Purpose Regis-
43