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24LC08B Datasheet(PDF) 10 Page - Microchip Technology |
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24LC08B Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 30 page  24AA08/24LC08B DS21710J-page 10 © 2009 Microchip Technology Inc. 8.0 READ OPERATION Read operations are initiated in the same way as write operations, with the exception that the R/W bit of the slave address is set to ‘1’. There are three basic types of read operations: current address read, random read and sequential read. 8.1 Current Address Read The 24XX08 contains an address counter that main- tains the address of the last word accessed, internally incremented by ‘1’. Therefore, if the previous access (either a read or write operation) was to address n, the next current address read operation would access data from address n + 1. Upon receipt of the slave address with R/W bit set to ‘1’, the 24XX08 issues an acknowl- edge and transmits the 8-bit data word. The master will not acknowledge the transfer, but does generate a Stop condition and the 24XX08 discontinues transmission (Figure 8-1). 8.2 Random Read Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, the word address must first be set. This is accomplished by sending the word address to the 24XX08 as part of a write operation. Once the word address is sent, the master generates a Start condition following the acknowledge. This terminates the write operation, but not before the internal Address Pointer is set. The master then issues the control byte again, but with the R/W bit set to a ‘1’. The 24XX08 will then issue an acknowledge and trans- mit the 8-bit data word. The master will not acknowl- edge the transfer, but does generate a Stop condition and the 24XX08 will discontinue transmission (Figure 8-2). 8.3 Sequential Read Sequential reads are initiated in the same way as a random read, except that once the 24XX08 transmits the first data byte, the master issues an acknowledge as opposed to a Stop condition in a random read. This directs the 24XX08 to transmit the next sequentially- addressed 8-bit word (Figure 8-3). To provide sequential reads, the 24XX08 contains an internal Address Pointer that is incremented by one upon completion of each operation. This Address Pointer allows the entire memory contents to be serially read during one operation. 8.4 Noise Protection The 24XX08 employs a VCC threshold detector circuit which disables the internal erase/write logic if the VCC is below 1.5V at nominal conditions. The SCL and SDA inputs have Schmitt Trigger and filter circuits which suppress noise spikes to assure proper device operation, even on a noisy bus. FIGURE 8-1: CURRENT ADDRESS READ SP Bus Activity Master SDA Line Bus Activity S T O P Control Byte Data (n) A C K N o A C K S T A R T x = “don’t care” 1 01 0 x B1 B0 1 Block Select Bits |
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