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MCP79402 Datasheet(PDF) 10 Page - Microchip Technology |
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MCP79402 Datasheet(HTML) 10 Page - Microchip Technology |
10 / 62 page MCP79400/MCP79401/MCP79402 DS20005009F-page 10 2011-2016 Microchip Technology Inc. FIGURE 4-2: ACKNOWLEDGE TIMING 4.1.2 DEVICE ADDRESSING The control byte is the first byte received following the Start condition from the master device (Figure 4-3). The control byte begins with a 4-bit control code. For the MCP7940X, this is set as ‘1010’ for EEPROM read and write operations, and ‘1101’ for SRAM/RTCC register read and write operations. The next three bits are non-configurable 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 slave address. Upon receiving a valid slave address, the slave device outputs an acknowledge signal on the SDA line. Depending on the state of the R/W bit, the MCP7940X 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 Slave Address Acknowledge Bit Start Bit Read/Write Bit 10 1 0 1 1 1 SACK R/W OR EEPROM Control Byte RTCC Register/SRAM Control Byte |
Similar Part No. - MCP79402 |
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Similar Description - MCP79402 |
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