ST7DALIF2 datasheet(100/171 Pages) STMICROELECTRONICS

100 / 171 page

Serial peripheral interface (SPI)

ST7DALIF2

100/171

Serial peripheral interface (SPI)

17.1

Introduction

The Serial Peripheral Interface (SPI) allows full-duplex, synchronous, serial communication

with external devices. An SPI system may consist of a master and one or more slaves or a

system in which devices may be either masters or slaves.

17.2

Main features

●

Full duplex synchronous transfers (on 3 lines)

●

Simplex synchronous transfers (on 2 lines)

●

Master or slave operation

●

Six master mode frequencies (fCPU/4 max.)

●

fCPU/2 max. slave mode frequency (see note)

●

SS Management by software or hardware

●

Programmable clock polarity and phase

●

End of transfer interrupt flag

●

Write collision, Master Mode Fault and Overrun flags

Note:

In slave mode, continuous transmission is not possible at maximum frequency due to the

software overhead for clearing status flags and to initiate the next transmission sequence.

17.3

General description

Figure 45 shows the serial peripheral interface (SPI) block diagram. There are 3 registers:

– SPI Control Register (SPICR)

– SPI Control/Status Register (SPICSR)

– SPI Data Register (SPIDR)

The SPI is connected to external devices through 3 pins:

– MISO: Master In / Slave Out data

– MOSI: Master Out / Slave In data

– SCK: Serial Clock out by SPI masters and input by SPI slaves

–SS: Slave select:

This input signal acts as a ‘chip select’ to let the SPI master communicate with slaves

individually and to avoid contention on the data lines. Slave SS inputs can be driven

by standard I/O ports on the master device.

ST7DALIF2 bảng dữ liệu(PDF) 100 Page - STMicroelectronics

ST7DALIF2 bảng dữ liệu(HTML) 100 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL