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TSS463-AA Datasheet(PDF) 8 Page - ATMEL Corporation |
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TSS463-AA Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 60 page  8 TSS463-AA 4205B–AUTO–12/04 When the master (CPU) conducts a read, it sends an address byte, a control byte and dummy characters ("0xFF" for instance) on its MOSI line. In the case of a VAN mes- sages RAM read (VAN frame received), the first data byte sent back by the TSS463AA on its MISO pin is the data length so the master knows how many dummy characters it must send to read the VAN frame properly. When the TSS463AA responds back with data, it will not take care of the MOSI line. The master must activate and de-activate SS between each data frame. Synchronization bytes must be monitored carefully. For instance, if “0xAA” and “0x55” are not monitored correctly, then the previous transmission may be incorrect too. A control byte containing "0x00" or "0xFF" is forbidden except during an "Initialization Sequence". Intel SPI Mode The Intel SPI mode is the second type of interface. As mentioned before, the TSS463AA enters this mode if the Initialization Sequence contains (first two bytes received) "0xFF, 0xFF". This mode is fully compatible to the Intel UART serial interface programmed in mode 0 only. It is the same as Motorola SPI mode (same CPOL and CPHA) but with inverted communication sense (LSB first and MSB last). The protocol is also the same. However, from the master point of view (host microcontroller), the hardware is different. Figure 5 shows how to connect the TSS463AA and Intel type microcontroller. Figure 5. Typical Application With the 8051 UART in Mode 0 Notes: 1. The RESET pin can either be connected to GND through a 1 µF capacitor, or the microcontroller RESET pin or unconnected (inactive with internal pull-up). INT IRQ PORT X.z SS POR T X.y RXD 1 2 3 4 5 6 7 89 10 11 12 13 14 15 SCLK MISO MOSI RxD0 RxD1 RxD2 TXD RESET (1) VDD GND CKOUT XTAL1 XTAL2 TXD VAN Bus General I/O Remaining pins TEST/VSS XTAL1 C1 C2 100k (if needed) optional RESET (1) 16 |
Similar Part No. - TSS463-AA |
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Similar Description - TSS463-AA |
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