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ADM1023 Arkusz danych(PDF) 10 Page - Analog Devices |
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ADM1023 Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 12 page ADM1023 –10– REV. A In the case of the ADM1023, write operations contain either one or two bytes, while read operations contain one byte and perform the following functions: 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, then data can 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 regis- ter selected by the address pointer register. This is illustrated in Figure 14. 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. When reading data from a register there are two possibilities: 1. If the ADM1023’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 ADM1023 as before, but only the data byte containing the register read address is sent, as data is not to be written to the register. This is shown in Figure 15. A read operation is then performed consisting of the serial bus address, R/ W bit set to 1, followed by the data byte read from the data register. This is shown in Figure 15. 2. If the Address Pointer Register is known to be already at the desired address, data can be read from the corresponding data register without first writing to the Address Pointer Reg- ister, so Figure 15 can be omitted. NOTES 1. Although it is possible to read a data byte from a data register without first writing to the Address Pointer Register, if the Address Pointer Register is already at the correct value, it is not possible to write data to a register without writing to the Address Pointer Register, because the first data byte of a write is always written to the Address Pointer Register. 2. Do not forget that ADM1023 registers have different addresses for read and write operations. The write address of a register must be written to the Address Pointer if data is to be written to that register, but it is not possible to read data from that address. The read address of a register must be written to the Address Pointer before data can be read from that register. R/ W 0 SCLK SDATA 1 0 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1023 START BY MASTER 19 1 ACK. BY ADM1023 9 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1023 STOP BY MASTER 1 9 SCLK (CONTINUED) SDATA (CONTINUED) FRAME 3 DATA BYTE FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE Figure 14. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register R/ W 0 SCLK SDATA 1 0 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1023 START BY MASTER 19 1 ACK. BY ADM1023 9 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE STOP BY MASTER Figure 15. Writing to the Address Pointer Register Only R/ W SCLK SDATA D7 D6 D5 D4 D3 D2 D1 D0 NO ACK. BY MASTER START BY MASTER 9 1 ACK. BY ADM1023 9 FRAME 1 SERIAL BUS ADDRESS BYTE STOP BY MASTER A6 A5 A4 A3 A2 A1 A0 FRAME 2 DATA BYTE FROM ADM1023 1 Figure 16. Reading Data from a Previously Selected Register |
Podobny numer części - ADM1023 |
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Podobny opis - ADM1023 |
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