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: 27/52页
文件大小: 479K
代理商: AT86RF401E
27
AT86RF401
1424F
RKE
12/03
The internal data SRAM access is performed in two System Clock cycles as described
in Figure 24.
Figure 24.
On-chip Data SRAM Access Cycles
All I/Os and peripherals are placed in the I/O space. The I/O locations are accessed by
the IN and OUT instructions, transferring data between the 32 general-purpose working
registers and the I/O space. I/O registers within the address range $00
$1F are directly
bit-accessible using the SBI and CBI instructions. In these registers, the value of single
bits can be checked by using the SBIS and SBIC instructions. Refer to Table 10,
Instruction Set Manual,
on page 44 for more details. When using the I/O specific com-
mands IN and OUT, the I/O addresses $00
$3F must be used. When addressing I/O
registers as SRAM, $20 must be added to these addresses.
For compatibility with future devices, reserved bits should be written to
0
if accessed.
Reserved I/O memory addresses should never be written.
Some of the status flags are cleared by writing a logical
1
to them. Note that the CBI
and SBI instructions will operate on all bits in the I/O register, writing a
1
back into any
flag read as set, thus clearing the flag. The CBI and SBI instructions work with registers
$00 to $1F only.
The I/O and peripherals control registers are explained in the following sections.
System Clock
Write
Read
Data
Data
Address
Address
T1
T2
T3
T4
Prev. Address
R
W
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