ATTINY20-EK1 Atmel, ATTINY20-EK1 Datasheet - Page 9
ATTINY20-EK1
Manufacturer Part Number
ATTINY20-EK1
Description
KIT EVAL TOUCH ATTINY20
Manufacturer
Atmel
Datasheet
1.ATTINY20-EK1.pdf
(224 pages)
Specifications of ATTINY20-EK1
Sensor Type
*
Sensing Range
*
Interface
*
Sensitivity
*
Voltage - Supply
*
Embedded
*
Utilized Ic / Part
*
Silicon Manufacturer
Atmel
Core Architecture
AVR
Core Sub-architecture
TinyAVR
Kit Contents
Board
Svhc
No SVHC (15-Dec-2010)
Mcu Supported Families
ATtiny20
Tool / Board Applications
Microcontroller
Rohs Compliant
Yes
Tool Type
Development Kit
Cpu Core
AVR 8
Data Bus Width
8 bit
Processor To Be Evaluated
ATtiny20
Interface Type
Touch
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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4.4
4.4.1
8235B–AVR–04/11
General Purpose Register File
The X-register, Y-register, and Z-register
The Register File is optimized for the AVR Enhanced RISC instruction set. In order to achieve
the required performance and flexibility, the following input/output schemes are supported by the
Register File:
Figure 4-2
Figure 4-2.
Note:
Most of the instructions operating on the Register File have direct access to all registers, and
most of them are single cycle instructions.
Registers R26:R31 have some added functions to their general purpose usage. These registers
are 16-bit address pointers for indirect addressing of the data space. The three indirect address
registers X, Y, and Z are defined as described in
• One 8-bit output operand and one 8-bit result input
• Two 8-bit output operands and one 8-bit result input
• One 16-bit output operand and one 16-bit result input
A typical implementation of the AVR register file includes 32 general prupose registers but
ATtiny20 implements only 16 registers. For reasons of compatibility the registers are numbered
R16:R31 and not R0:R15.
Registers
Purpose
General
Working
below shows the structure of the 16 general purpose working registers in the CPU.
AVR CPU General Purpose Working Registers
7
R16
R17
R18
R26
R27
R28
R29
R30
R31
…
0
Figure
4-3.
X-register High Byte
Y-register High Byte
Z-register High Byte
X-register Low Byte
Z-register Low Byte
Y-register Low Byte
ATtiny20
9
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