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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP7940N-E/MS датащи(PDF) 10 Page - Microchip Technology |
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MCP7940N-E/MS датащи(HTML) 10 Page - Microchip Technology |
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10 / 58 page  MCP7940N DS20005010J-page 10 2011-2022 Microchip Technology Inc. and its subsidiares FIGURE 4-2: ACKNOWLEDGE TIMING 4.1.2 DEVICE ADDRESSING The control byte is the first byte received following the Start condition from the host device (Figure 4-3). The control byte begins with a 4-bit control code. For the MCP7940N, this is set ‘1101’ for register read and write operations. The next three bits are non-config- urable Chip Select bits that must always be set to ‘1’. The last bit of the control byte defines the operation to be performed. When set to a ‘1’ a read operation is selected, and when set to a ‘0’ a write operation is selected. The combination of the 4-bit control code and the three Chip Select bits is called the client address. Upon receiving a valid client address, the client device out- puts an acknowledge signal on the SDA line. Depend- ing on the state of the R/W bit, the MCP7940N will select a read or a write operation. FIGURE 4-3: CONTROL BYTE FORMAT SCL 9 8 7 6 5 4 3 2 11 2 3 Transmitter must release the SDA line at this point allowing the Receiver to pull the SDA line low to acknowledge the previous eight bits of data. Receiver must release the SDA line at this point so the Transmitter can continue sending data. Data from transmitter Data from transmitter SDA Acknowledge Bit 11 0 1 1 1 1 SACK R/W Control Code Chip Select Bits Acknowledge Bit Start Bit Read/Write Bit RTCC Register/SRAM Control Byte |
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