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Zakładka z wyszukiwarką danych komponentów |
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FM25040-P Arkusz danych(PDF) 4 Page - List of Unclassifed Manufacturers |
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FM25040-P Arkusz danych(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 14 page  Ramtron FM25040 11 May 2000 4/14 Serial Peripheral Interface – SPI Bus The FM25040 employs a Serial Peripheral Interface (SPI) bus. This high-speed serial bus provides high performance serial communication with a host microcontroller. Many common microcontrollers have hardware SPI ports allowing a direct interface. It is quite simple to emulate the SPI interface using ordinary port pins for microcontrollers that do not. Note that the FM25040 operates in SPI Mode 0 only. The SPI interface uses a total of four pins; clock, data-in, data-out, and chip select. It is possible to connect the two data lines together. Figure 2 illustrates a typical system configuration using the FM25040 with a microcontroller that offers an SPI port. Figure 3 shows a similar configuration for a microcontroller that has no hardware support for the SPI bus. Protocol Overview The SPI interface is a synchronous serial interface using clock and data lines. It is intended to support multiple devices on the bus. Each device is activated using a chip select. Once chip select is activated by the bus master, the FM25040 will begin monitoring the clock and data lines. The relationship between the falling edge of /CS, the clock and data is dictated by the SPI mode. There are four such modes however the FM25040 supports only mode 0. This mode dictates that the SCK signal must be low when /CS is activated. The SPI protocol is controlled by op-codes. These op-codes specify the commands to the part. After /CS is activated, the first byte transferred from the bus master is the op-code. Following the op-code, any addresses and data are then transferred. Certain op- codes are commands with no subsequent data transfer. The /CS must go inactive after an operation is complete and before a new op-code can be issued. Figure 2. System Configuration with SPI port Figure 3. System Configuration without SPI port |
Podobny numer części - FM25040-P |
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Podobny opis - FM25040-P |
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