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AM24LC16I Arkusz danych(PDF) 6 Page - Anachip Corp |
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AM24LC16I Arkusz danych(HTML) 6 Page - Anachip Corp |
6 / 10 page 2-Wire Serial 16K-bits (2048 x 8) CMOS Electrically Erasable PROM AM24LC16 Anachip Corp. www.anachip.com.tw Rev. A1 Oct 20, 2003 6/10 ATC Write Operations (Continued) Current Address Read The AM24LC16 contains an address counter that maintains the address of the last accessed word, internally incremented by one. 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 one, the AM24LC16 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 AM24LC16 discontinues transmission. (Shown in Figure 6) 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 AM24LC16 as part of a write operation. After 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. Then the master issues the control byte again but with R/W bit set to a one. The AM24LC16 will then issue an acknowledge and transmit the eight bit data word. The master will not acknowledge the transfer but does generate a stop condition and the AM24LC16 discontinues transmission. (Shown in Figure 7) Sequential Read Sequential read is initiated in the same way as a random read except that after the AM24LC16 transmits the first data byte, the master issues an acknowledge as opposed to a stop condition in a random read. This directs the AM24LC16 to transmit the next sequentially addressed 8 bit byte (Shown in Figure 8). To provide sequential read the AM24LC16 contains an internal address pointer which is incremented by one at the completion of each operation. Noise Protection The SCL and SDA inputs have filter circuits which suppress noise spikes to assure proper device operation even on a noisy bus. |
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