AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 9

• Manufacturer Part Number: AT43USB325E-AU
• Description: IC USB KEYBOARD CTRLR 64LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB325E-AU

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: SRAM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: SPI, 3-Wire Serial
• Number Of I /o: 42
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. General-purpose Register File
3355C–USB–4/05
Table 3-1.
All register operating instructions in the instruction set have direct and single cycle access to all
registers. The only exception is the five constant arithmetic and logic instructions SBCI, SUBI,
CPI, ANDI, and ORI between a constant and a register, and the LDI instruction for load immedi-
ate constant data. These instructions apply to the second half of the registers in the register file
– R16..R31. The general SBC, SUB, CP, AND, and OR and all other operations between two
registers or on a single register apply to the entire register file.
As shown in
directly into the first 32 locations of the user Data Space. Although not being physically imple-
mented as SRAM locations, this memory organization provides great flexibility in access of the
registers, as the X-, Y-, and Z-registers can be set to index any register in the file.
Register
R0
R1
R2
..
R13
R14
R15
R16
R17
..
R26
R27
R28
R29
R30
R31
Table
AVR CPU General-purpose Working Register
3-1, each register is also assigned a data memory address, mapping them
Address
$00
$01
$02
$0D
$0E
$0F
$10
$11
$1A
$1B
$1C
$1D
$1E
$1F
Comment
X-register low byte
X-register high byte
Y-register low byte
Y-register high byte
Z-register low byte
Z-register high byte
AT43USB325
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