2019-11-22 15:34:11, 修改于2020-01-07 17:05:49
Browse functions are initiated inside the very same way as writeoperations using the exception which the R/W bit of thecontrol byte is about to 1. There are three primary typesof browse operations: recent tackle browse, random examine,and sequential study.six.1 Current Address ReadThe 24XX64 consists of an deal with counter that main-tains the deal with with the past term accessed, internallyincremented by a person.
As a result, if the former readaccess was to address n (n is any authorized handle), thenext present-day deal with read through procedure would obtain datafrom address n + 1. Upon receipt of the management byte with R/W little bit established to one,the 24XX64 issues an acknowledge and transmits theeight little bit info term. The master will not likely acknowledgethe transfer but does make a Stop condition andthe 24XX64 discontinues transmission (Determine 6-1).6.2 Random ReadRandom read through functions enable the master to accessany memory site inside of a random way. To performthis form of read through operation, initial the word address mustbe set.
This is often finished by sending the word handle to the24XX64 as section of a produce procedure (R/W little bit established to 0).Just after the phrase address is shipped, the learn generates aSTART situation next the accept. This ter-minates the produce procedure, although not just before the internaladdress pointer is about.
Then the learn difficulties thecontrol byte all over again but while using the R/W bit set into a just one. The24XX64 will then concern an acknowledge and transmitthe 8-bit knowledge word. The learn will not likely acknowledgethe transfer but does crank out a Stop problem whichcauses the 24XX64 to discontinue transmission.
Right after a random go through command, the inter-nal handle counter will issue into the tackle locationfollowing the one particular that was just browse. six.three Sequential ReadSequential reads are initiated in the identical way like a ran-dom read through apart from that right after the 24XX64 transmits thefirst data byte, the grasp issues an accept asopposed for the Quit condition employed in a random go through.This accept directs the 24XX64 to transmit thenext sequentially resolved 8-bit term.
Pursuing the ultimate byte transmitted to the grasp, themaster won't create an acknowledge but will gen-erate a End issue. To deliver sequential readsthe 24XX64 consists of an inner handle pointer whichis incremented by a single within the completion of each and every oper-ation. This tackle pointer will allow all the memorycontents to generally be serially study in the course of one particular operation. Theinternal handle pointer will mechanically roll over fromaddress 1FFF to address 0000 if your learn acknowl-edges the byte acquired from the array handle 1FFF.
