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參數(shù)資料
| 型號： | AT43USB326-AU |
| 廠商： | Atmel Corp. |
| 英文描述： | Multimedia USB Keyboard Controller with Embedded Hub |
| 中文描述： | 多媒體USB鍵盤控制器的嵌入式集線器 |
| 文件頁數(shù)： | 9/102頁 |
| 文件大小： | 511K |
| 代理商： | AT43USB326-AU |
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9
AT43USB326
3313D–USB–04/06
SRAM Data
Memory
Table 3 summarizes how the AT43USB326 SRAM Memory is organized. The lower 608 Data
Memory locations address the Register file, the I/O Memory and the internal data SRAM. The
first 96 locations address the Register File + I/O Memory, and the next 512 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 reg-
isters. Direct addressing reaches the entire data space.
The Indirect with Displacement mode features 63 address locations that reach 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 and incremented.
The 32 general-purpose working registers, 64 I/O registers and the 512 bytes of internal data
SRAM in the AT43USB326 are all accessible through these addressing modes.
To manage the USB hardware, a special set of registers is assigned. These registers are
mapped to SRAM space between addresses $1F00 and 1FFF. Table 3 and Table 4 give an
overview of these registers.
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