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參數(shù)資料
| 型號： | NRF9E5-EVKIT868 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| 中文描述： | 433/868/915MHz RF收發(fā)器與8051兼容的嵌入式微控制器和4輸入，10位ADC |
| 文件頁數(shù)： | 68/104頁 |
| 文件大小： | 1436K |
| 代理商： | NRF9E5-EVKIT868 |
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PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone +4772898900 - Fax +4772898989
Revision: 1.1
Page 68 of 104
June 2004
18.4
Instruction Timing
Instruction cycles in the nRF9E5 are four clock cycles in length, as opposed to twelve
clock cycles per instruction cycle in the standard 8051. This translates to a 3X
improvement in execution time for most instructions. However, some instructions
require a different number of instruction cycles on the nRF9E5 than they do on the
standard 8051. In the standard 8051, all instructions except for MUL and DIV take one
or two instruction cycles to complete. In the nRF9E5 architecture, instructions can take
between one and five instruction cycles to complete. For example, in the standard 8051,
the instructions MOVX A, @DPTR and MOV direct, direct each take two instruction
cycles (twenty-four clock cycles) to execute. In the nRF9E5 architecture, MOVX A,
@DPTR takes two instruction cycles (eight clock cycles) and MOV direct, direct takes
three instruction cycles (twelve clock cycles). Both instructions execute faster on the
nRF9E5 than they do on the standard 8051, but require different numbers of clock
cycles.
For timing of real-time events, use the numbers of instruction cycles from Table 55 to
Table 60 to calculate the timing of software loops. The bytes column of these table
indicates the number of memory accesses (bytes) needed to execute the instruction. In
most cases, the number of bytes is equal to the number of instruction cycles required to
complete the instruction. However, as indicated in Table 55, there are some instructions
(for example, DIV and MUL) that require a greater number of instruction cycles than
memory accesses.By default, the nRF9E5 timer/counters run at twelve clock cycles per
increment so that timer-based events have the same timing as with the standard 8051.
The timers can be configured to run at four clock cycles per increment to take advantage
of the higher speed of the nRF9E5.
18.5
Dual Data Pointers
The nRF9E5 employs dual data pointers to accelerate data memory block moves. The
standard 8051 data pointer (DPTR) is a 16-bit value used to address external data RAM
or peripherals. The nRF9E5 maintains the standard data pointer as DPTR0 at SFR
locations 0x82 and 0x83. It is not necessary to modify code to use DPTR0. The nRF9E5
adds a second data pointer (DPTR1) at SFR locations 0x84 and 0x85. The SEL bit in the
DPTR Select register, DPS (SFR 0x86), selects the active pointer. When SEL = 0,
instructions that use the DPTR will use DPL0 and DPH0. When SEL = 1, instructions
that use the DPTR will use DPL1 and DPH1. SEL is the bit 0 of SFR location 0x86. No
other bits of SFR location 0x86 are used. All DPTR-related instructions use the
currently selected data pointer. To switch the active pointer, toggle the SEL bit. The
fastest way to do so is to use the increment instruction (INC DPS). This requires only
one instruction to switch from a source address to a destination address, saving
application code from having to save source and destination addresses when doing a
block move. Using dual data pointers provides significantly increased efficiency when
moving large blocks of data.
The SFR locations related to the dual data pointers are:
- 0x82 DPL0 DPTR0 low byte
- 0x83 DPH0 DPTR0 high byte
- 0x84 DPL1 DPTR1 low byte
- 0x85 DPH1 DPTR1 high byte
- 0x86 DPS DPTR Select (LSB)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| nRF9E5-EVKIT-868/915 | 功能描述:射頻開發(fā)工具 NRF9E5 EVAL KIT 868/915 RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| NRF9E5-EVKIT915 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| NRF9E5IC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| nRF9E5-REEL | 功能描述:射頻收發(fā)器 433/868/915MHz TRNSCVR RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| NRF-D | 制造商:IDEC 功能描述:35mmDINKi[pT[Lbgz_ Bulk 制造商:IDEC CORPORATION 功能描述:DIN RAIL MT.ADAPTOR |
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