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AK5522 Arkusz danych(PDF) 74 Page - Asahi Kasei Microsystems |
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AK5522 Arkusz danych(HTML) 74 Page - Asahi Kasei Microsystems |
74 / 84 page [AK5522] 017002311-E-00 2017/03 - 74 - READ Operations Set the R/W bit = “1” for the READ operation of the AK5522. After transmission of data, the master can read the next address’s data by generating acknowledge instead of terminating the write cycle after the receipt of the first data word. After receiving each data packet the internal 6-bit address counter is incremented by one, and the next data is automatically taken into the next address. If the address exceeds “04H” prior to generating stop condition, the address counter will “roll over” to “00H” and the data of “00H” will be read out. The AK5522 supports two basic read operations: Current Address Read and Random Address Read. (1) Current Address Read The AK5522 contains an internal address counter that maintains the address of the last word accessed, incremented by one. Therefore, if the last access (either a read or write) was to address “n”, the next CURRENT READ operation would access data from the address “n+1”. After receipt of the slave address with R/W bit “1”, the AK5522 generates acknowledge, transmits 1-byte of data to the address set by the internal address counter and increments the internal address counter by 1. If the master does not generate acknowledge but generates a stop condition instead, the AK5522 ceases transmission. SDA S T A R T A C K A C K S Slave Address A C K Data(n+1) P S T O P Data(n+x) A C K Data(n+2) A C K R/W= “1” A C K Data(n) Figure 76. Current Address Read (2) Random Address Read The random read operation allows the master to access any memory location at random. Prior to issuing a slave address with the R/W bit =“1”, the master must execute a “dummy” write operation first. The master issues a start request, a slave address (R/W bit = “0”) and then the register address to read. After the register address is acknowledged, the master immediately reissues the start request and the slave address with the R/W bit =“1”. The AK5522 then generates acknowledge, 1 byte of data and increments the internal address counter by 1. If the master does not generate acknowledge but generates a stop condition instead, the AK5522 ceases transmission. SDA S T A R T A C K A C K S Slave Address A C K Data(n) P S T O P Data(n+x) A C K Data(n+1) A C K R/W= “0” A C K Sub Address(n) S T A R T A C K S Slave Address R/W= “1” Figure 77. Random Address Read |
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