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24AA00T-EP Datasheet(PDF) 8 Page - Microchip Technology |
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24AA00T-EP Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 18 page  24AA00/24LC00/24C00 DS21178D-page 8 2003 Microchip Technology Inc. 8.0 READ OPERATIONS 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 one. There are three basic types of read operations: current address read, random read, and sequential read. 8.1 Current Address Read The 24XX00 contains an address counter that main- tains the address of the last word accessed, internally incremented by one. Therefore, if the previous read access was to address n, the next current address read operation would access data from address n + 1. Upon receipt of the slave address with the R/W bit set to one, the device issues an acknowledge and transmits the eight-bit data word. The master will not acknowledge the transfer but does generate a Stop condition and the device 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, first the word address must be set. This is done by sending the word address to the device as part of a write operation. After the word address is sent, the master generates a Start condition following the acknowledge. This termi- nates the write operation, but not before the internal address pointer is set. Then the master issues the control byte again but with the R/W bit set to a one. The 24XX00 will then issue an acknowledge and transmits the eight bit data word. The master will not acknowl- edge the transfer but does generate a Stop condition and the device discontinues transmission (Figure 8-2). After this command, the internal address counter will point to the address location following the one that was just read. 8.3 Sequential Read Sequential reads are initiated in the same way as a random read except that after the device transmits the first data byte, the master issues an acknowledge as opposed to a Stop condition in a random read. This directs the device to transmit the next sequentially addressed 8-bit word (Figure 8-3). To provide sequential reads the 24XX00 contains an internal address pointer which is incremented by one at the completion of each read operation. This address pointer allows the entire memory contents to be serially read during one operation. FIGURE 8-1: CURRENT ADDRESS READ BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY P S S T O P CONTROL BYTE S T A R T DATA A C K N O A C K 11 00 X X X 1 X = Don’t Care Bit |
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