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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SRI512 датащи(PDF) 35 Page - STMicroelectronics |
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SRI512 датащи(HTML) 35 Page - STMicroelectronics |
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35 / 47 page  SRI512 SRI512 commands 35/47 8.7 Read_block(Addr) command Command code = 08h On receiving the Read_block command, the SRI512 reads the desired block and returns the 4 data bytes contained in the block. Data bytes are transmitted with the Least Significant byte first and each byte is transmitted with the least significant bit first. The address byte gives access to the 16 blocks of the SRI512 (addresses 0 to 15). Read_block commands issued with a block address above 15 will not be interpreted and the SRI512 will not return any response, except for the System area located at address 255. The SRI512 must have received a Select() command and be switched to Selected state before any Read_block() command can be accepted. All Read_block() commands sent to the SRI512 before a Select() command is issued are ignored. Figure 41. Read_block request format Request parameter: ● Address: block addresses from 0 to 15, or 255 Figure 42. Read_block response format Response parameters: ● Data 1: Less significant data byte ● Data 2: Data byte ● Data 3: Data byte ● Data 4: Most significant data byte Figure 43. Read_block frame exchange between reader and SRI512 SOF Read_block CRCL CRCH EOF AI07684b 08h 8 bIts 8 bits 8 bits Address SOF Data 1 CRCL CRCH EOF AI07685b 8 bits Data 2 Data 3 Data 4 8 bIts 8 bIts 8 bIts 8 bIts 8 bIts SOF Data 1 AI10948b Data 2 Data 3 Data 4 Reader SRI512 CRCL CRCH EOF <-t0-> <-t1-> SOF 08h CRCL CRCH EOF ADDR |
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