基于單片機(jī)的溫濕度控制系統(tǒng)英文文獻(xiàn)-wenkub
2023-06-15 12:00:43 本頁(yè)面
【正文】 sticated development system with a hardware emulation capability as well as the use of powerful software tools.Some manufacturers provide additional ROM options by including in their range devices with (or intended for use with) user programmable memory. The simplest of these is usually device which can operate in a microprocessor mode by using some of the input/output lines as an address and data bus for accessing external memory. This type of device can behave functionally as the single chip microputer from which it is derived albeit with restricted I/O and a modified external circuit. The use of these ROM less devices is mon even in production circuits where the volume does not justify the development costs of custom onchip ROM[2]。These devices are naturally more expensive than equivalent ROM device, but do provide plete circuit equivalents. EPROM based devices are also extremely attractive for lowvolume applications where they provide the advantages of a singlechip device, in terms of onchip I/O, etc. ,with the convenience of flexible user programmability.Random access memory (RAM). RAM is for the storage of working variables and data used during program execution. The size of this memory varies with device type but it has the same characteristic width (4,8,16 bits etc.) as the processor ,Special function registers, such as stack pointer or timer register are often logically incorporated into the RAM area. It is also mon in Hard type microputers to treat the RAM area as a collection of register。一些廠家用這兩種特性區(qū)分程序內(nèi)存和數(shù)據(jù)內(nèi)存在硬件中的特性，依據(jù)同樣的原理廣泛的適用于一般目的的電腦和微電腦，一些廠家在程序內(nèi)存和數(shù)據(jù)內(nèi)存之間不區(qū)分的像Princeton特性。一些制造商在其提供的設(shè)備包括的范圍（或擬使用）[2]。這些器件自然價(jià)格比同等ROM設(shè)備貴，他們提供的單芯片器件的優(yōu)勢(shì)，在以下方面的板載I / O等，在靈活的用戶(hù)可編程帶來(lái)的便利。對(duì)設(shè)施良好與否進(jìn)行的測(cè)試，設(shè)置和重置單個(gè)位的內(nèi)存或I
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