AT43USB326 datasheet(9/102 Pages) ATMEL

номер детали	AT43USB326

подробное описание детали	Multimedia USB Keyboard Controller with Embedded Hub

PDF	102 Pages

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производитель	ATMEL [ATMEL Corporation]

домашняя страница	http://www.atmel.com

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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.

AT43USB326 датащи(PDF) 9 Page - ATMEL Corporation