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AM2404VSA Scheda tecnica(PDF) 6 Page - Anachip Corp |
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AM2404VSA Scheda tecnica(HTML) 6 Page - Anachip Corp |
6 / 12 page 2-Wire Serial 4K-Bit (512 x 8) CMOS Electrically Erasable PROM AM24LC04 Anachip Corp. www.anachip.com.tw Rev. A2 Oct 20, 2003 6/12 ATC Write Operations (Continued) Write Protection Programming will not take place if the WP pin of the AM24LC04 is connected to Vcc. The AM24LC04 will accept slave and byte addresses. But if the memory accessed is write protected by the WP pin, the AM24LC04 will not generate an acknowledge after the first byte of data has been received, and thus the programming cycle will not be started when the stop condition is asserted. 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. Current Address Read The AM24LC04 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 AM24LC04 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 AM24LC04 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 AM24LC04 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 AM24LC04 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 AM24LC04 discontinues transmission. (Shown in Figure 7) Sequential Read Sequential reads are initiated by either a current address read or a random read. After the master receives a data word, it responds with an acknowledge. As long as the E 2PROM receives an acknowledge, it will continue to increment the data words. When the memory address limit is reached, the data word address will “roll over” and the sequential read will continue. The sequential read operation is terminated when the master does not respond with a zero but does generate a following stop condition. |
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