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NCT210 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCT210 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page NCT210 http://onsemi.com 11 before the 10th clock pulse, then high during the 10th clock pulse to assert a stop condition. Any number of bytes of data can be transferred over the serial bus in one operation, but it is not possible to mix read and write in one operation, because the type of operation is determined at the beginning and cannot subsequently be changed without starting a new operation. For the NCT210, write operations contain either one or two bytes, while read operations contain one byte. To write data to one of the device data registers or read data from it, the address pointer register must be set so that the correct data register is addressed, data can then be written into that register or read from it. The first byte of a write operation always contains a valid address that is stored in the address pointer register. If data is to be written to the device, the write operation contains a second data byte that is written to the register selected by the address pointer register. This is illustrated in Figure 13. The device address is sent over the bus followed by R/W set to 0. This is followed by two data bytes. The first data byte is the address of the internal data register to be written to, which is stored in the address pointer register. The second data byte is the data to be written to the internal data register. Figure 13. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register A6 SCLK SDATA A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY NCT210 START BY MASTER 19 1 ACK. BY NCT210 9 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY NCT210 STOP BY MASTER 1 9 SCLK (CONTINUED) SDATA (CONTINUED) FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE FRAME 3 DATA BYTE R/W Figure 14. Writing to the Address Pointer Register Only A6 SCLK SDATA A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY NCT210 STOP BY MASTER START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE 1 1 9 ACK. BY NCT210 9 R/W Figure 15. Reading Data from a Previously Selected Register A6 SCLK SDATA A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 NO ACK. BY MASTER STOP BY MASTER START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 DATA BYTE FROM NCT210 1 1 9 ACK. BY NCT210 9 R/W When reading data from a register there are two possibilities: 1. If the NCT210’s address pointer register value is unknown or not the desired value, it is first necessary to set it to the correct value before data can be read from the desired data register. This is done by performing a write to the NCT210 as before, but only the data byte containing the register read address is sent, because data is not to be written to the register. This is shown in Figure 14. A read operation is then performed consisting of the serial bus address, R/W bit set to 1, followed |
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