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24C04A-ESM Datasheet(PDF) 8 Page - Microchip Technology |
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24C04A-ESM Datasheet(HTML) 8 Page - Microchip Technology |
8 / 12 page 24C04A DS11183E-page 8 © 1998 Microchip Technology Inc. FIGURE 9-1: CURRENT ADDRESS READ FIGURE 9-2: RANDOM READ FIGURE 9-3: SEQUENTIAL READ SP BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T S T O P CONTROL BYTE DATA n A C K N O A C K S P S BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T S T O P CONTROL BYTE A C K WORD ADDRESS (n) CONTROL BYTE S T A R T DATA (n) A C K A C K N O A C K P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T O P CONTROL BYTE A C K N O A C K DATA n DATA n + 1 DATA n + 2 DATA n + X A C K A C K A C K 9.0 READ MODE In this mode the 24C04A transmits data to the master devide. As can be seen from Figure 9-2 and Figure 9-3, the master first sets up the slave and word addresses by doing a write. (Note: Although this is a read mode, the address pointer must be written to). During this period the 24C04A generates the necessary acknowledge bits as defined in the appropriate section. The master now generates another START condition and transmits the slave address again, except this time the read/write bit is set into the read mode. After the slave generates the acknowledge bit, it then outputs the data from the addressed location on to the SDA pin, increments the address pointer and, if it receives an acknowledge from the master, will transmit the next consecutive byte. This auto-increment sequence is only aborted when the master sends a STOP condition instead of an acknowledge. Note 1: If the master knows where the address pointer is, it can begin the read sequence at the current address (Figure 9-1) and save time transmitting the slave and word addresses. Note 2: In all modes, the address pointer will not increment through a block (256 byte) boundary, but will rotate back to the first location in that block. |
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