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DS2480S Datasheet(PDF) 11 Page - Dallas Semiconductor |
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DS2480S Datasheet(HTML) 11 Page - Dallas Semiconductor |
11 / 26 page DS2480 042498 11/26 The syntax of configuration commands is very simple. Each 8–bit code word contains a 3–bit parameter code to specify the parameter and the 3–bit value code to be selected. Bit 7 of the command code is set to 0 and bit 0 is always a 1. To read the value code of a parameter, one writes all zeros for the parameter code and puts the parameter code in place of the parameter value code. Table 5 shows the details. The configuration command response byte is similar to the command byte itself. Bit 0 of the response byte is always 0. When writing a parameter, the upper 7 bits are the echo of the command code. When reading a param- eter, the current value code is returned in bit positions 1 to 3 with the upper 4 bits being the same as sent (see Table 6). CONFIGURATION COMMAND CODES Table 5 FUNCTION BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Write Parameter 0 parameter code parameter value code 1 Read Parameter 0 0 0 0 parameter code 1 CONFIGURATION COMMAND RESPONSE BYTE Table 6 FUNCTION BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Write Parameter 0 same as sent same as sent 0 Read Parameter 0 same as sent parameter value code 0 |
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