參數(shù)資料
型號： DS89C21TMX
元件分類： 收發(fā)器
英文描述： Transceiver
中文描述： 收發(fā)器
文件頁數(shù)： 25/48頁
文件大?。?/td> 934K
代理商： DS89C21TMX
DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
25 of 48
ROM Loader
The full on-chip flash program memory space, security flash block, and external SRAM can be programmed in-
system from an external source through serial port 0 under the control of a built-in ROM loader. The ROM loader
also has an auto-baud feature that determines which baud-rate frequencies are being used for communication and
sets the baud-rate generator for that speed.
When the DS89C430 is powered up and has entered its user operating mode, the ROM loader mode can be
invoked at any time by forcing RST = 1,
EA
= 0, and
PSEN
= 0. It remains in effect until power-down or when the
condition (RST = 1 and
PSEN
=
EA
= 0) is removed. Entering the ROM loader mode forces the processor to start
fetching from the 2kB internal ROM for program memory initialization and other loader functions.
The read/write accessibility is determined by the state of the lock bits, which can be verified directly by the ROM
loader.
The flash memory can be programmed (by the built-in ROM loader) using commands that are received over the
serial interface from a host PC. Full details of the ROM loader commands are given in the
Ultra-High-Speed Flash
Microcontroller User’s Guide
format
for more
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS89C21TMX/NOPB 功能描述:RS-422接口集成電路 RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率: 工作電源電壓:5 V 電源電流:35 mA 工作溫度范圍: 安裝風格:Through Hole 封裝 / 箱體:PDIP-16 封裝:Tube
DS89C386 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Twelve Channel CMOS Differential Line Receiver
DS89C386TMEA 功能描述:總線接收器 RoHS:否 制造商:Texas Instruments 接收機數(shù)量:4 接收機信號類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel
DS89C386TMEA/NOPB 功能描述:總線接收器 RoHS:否 制造商:Texas Instruments 接收機數(shù)量:4 接收機信號類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel
DS89C386TMEAX 制造商:Texas Instruments 功能描述:Twelve Receiver RS-422 48-Pin SSOP T/R
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