参数资料
型号: AT86RF401E
厂商: ATMEL CORP
元件分类: 通信及网络
英文描述: Smart RF Wireless Data Microtransmitter
中文描述: SPECIALTY TELECOM CIRCUIT, PDSO20
封装: 4.40 X 6.50 MM, 0.65 MM PITCH, TSSOP-20
文件页数: 19/52页
文件大小: 479K
代理商: AT86RF401E
19
AT86RF401
1424F
RKE
12/03
General-purpose
Register File
Figure 8 shows the structure of the 32 general-purpose working registers in the CPU.
Figure 8.
AVR CPU General-purpose Working Registers
All the 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 immediate 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 Figure 9, each register is also assigned a data memory address, mapping
the registers directly into the first 32 locations of the user data space. Although not being
physically implemented 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.
7
0
Addr.
R0
$00
R1
$01
R2
$02
R13
$0D
R14
$0E
R15
$0F
R16
$10
R17
$11
R26
$1A
X-register low byte
R27
$1B
X-register high byte
R28
$1C
Y-register low byte
R29
$1D
Y-register high byte
R30
$1E
Z-register low byte
R31
$1F
Z-register high byte
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