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CAT24C164VP2E-GT3 Scheda tecnica(PDF) 8 Page - ON Semiconductor |
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CAT24C164VP2E-GT3 Scheda tecnica(HTML) 8 Page - ON Semiconductor |
8 / 14 page CAT24C164 http://onsemi.com 8 READ OPERATIONS Immediate Read Upon receiving a Slave address with the R/W bit set to ‘1’, the CAT24C164 will interpret this as a request for data residing at the current byte address in memory. The CAT24C164 will acknowledge the Slave address, will immediately shift out the data residing at the current address, and will then wait for the Master to respond. If the Master does not acknowledge the data (NoACK) and then follows up with a STOP condition (Figure 10), the CAT24C164 returns to Standby mode. Selective Read Selective Read operations allow the Master device to select at random any memory location for a read operation. The Master device first performs a ‘dummy’ write operation by sending the START condition, slave address and byte address of the location it wishes to read. After the CAT24C164 acknowledges the byte address, the Master device resends the START condition and the slave address, this time with the R/W bit set to one. The CAT24C164 then responds with its acknowledge and sends the requested data byte. The Master device does not acknowledge the data (NoACK) but will generate a STOP condition (Figure 11). Sequential Read If during a Read session, the Master acknowledges the 1st data byte, then the CAT24C164 will continue transmitting data residing at subsequent locations until the Master responds with a NoACK, followed by a STOP (Figure 12). In contrast to Page Write, during Sequential Read the address count will automatically increment to and then wrap−around at end of memory (rather than end of page). Figure 10. Immediate Read Sequence and Timing SCL SDA 8th Bit STOP NO ACK DATA OUT 89 SLAVE ADDRESS S A C K DATA BYTE N O A C K S T O P P S T A R T BUS ACTIVITY: MASTER SLAVE Figure 11. Selective Read Sequence SLAVE ADDRESS S A C K A C K A C K S T A R T S S T A R T P S T O P ADDRESS BYTE N O A C K DATA BYTE BUS ACTIVITY: MASTER SLAVE SLAVE ADDRESS Figure 12. Sequential Read Sequence S T O P P SLAVE ADDRESS A C K A C K A C K N O A C K A C K DATA BYTE n DATA BYTE n+1 DATA BYTE n+2 DATA BYTE n+x BUS ACTIVITY: MASTER SLAVE |
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