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TSS463B Datasheet(PDF) 7 Page - ATMEL Corporation |
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TSS463B Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 59 page  7 TSS463B 4102E–AUTO–12/04 Figure 4. CPOL and CPHA in the TSS463B At the beginning of a transmission over the serial interface, the first byte is the address of the TSS463B register to be accessed. The next byte transmitted is the control byte that determines the direction of the communication. The following bytes are data bytes (consecutive bytes are written in or read from Address, Address + 1, Address + 2, ..., Address + n with n = 0 to 28). To make sure the TSS463B is not out of synchronization, the SPI interface will transmit data ’0xAA’and ’0x55’on the MISO pin during address and control byte time. This way, the master always ensures the TSS463B is well-synchronized. If the TSS463B is out of synchronization, the master can assert the SS pin inactive to resynchronize the SPI interface or can assert the RESET pin active or can send an initialization sequence. When the SS pin is inactive, the SCLK is allowed to toggle. This will have no effect on the TSS463B SPI module. SPI Control Byte The SPI control byte is transmitted by the master (CPU) to the TSS463B. It specifies whether it is a TSS463B Write or Read. Table 1. SPI Control Byte DIR: Serial Transfer Direction Zero: Read Operation. The data bytes will be read by the master (CPU) from the TSS463B. One: Write Operation. The data bytes will be written by the master (CPU) to the TSS463B. In both cases, address auto-increment mechanism will take place when more than one data byte is read or written. This mechanism is inhibited when address value reaches 0xFF. The seven following bits are reserved and must be equal to: 1100000. When the master (CPU) conducts a write, it sends an address byte, a control byte and data bytes on its MOSI line. The slave device (TSS463B) will send, if well-synchronized, ’0xAA’during the address byte and ’0x55’during the control byte on its MISO line. 0x55 SCLK MOSI SS SPI 8 Pulses Data Transmit Points Data Sample Points CPOL = CPHA = 1 MISO 0x66 7654321 0 DIR 110000 0 |
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