STR720 datasheet(186/401 Pages) STMICROELECTRONICS

186 / 401 page

STR720 - BUFFERED SPI (BSPI)

186/401

17 BUFFERED SPI (BSPI)

17.1 Introduction

The BSPI block is a standard 4-pin Serial Peripheral Interface for serial control

communication. It interfaces on one side to the SPI bus and on the other has a standard

The BSPI contains two 16-word x 16-bit FIFO’s one for receive and the other for transmit. The

BSPI can directly operate with words 8 and 16 bit long and can generates interrupts or DMA

requests separately for receive and transmit events.

17.2 Main Features

■

Programmable depth receive FIFO.

■

Maximum 16 word Receive FIFO.

■

Programmable depth transmit FIFO.

■

Maximum 16 word Transmit FIFO.

■

Master and Slave modes supported.

■

Internal clock prescaler.

■

Programmable DMA interface

17.3 Functional Description

The processor views the BSPI as a memory mapped peripheral, which may be used by

standard

polling,

interrupt

programming

techniques

DMA

controlled

access.

Memory-mapping means processor communication can be achieved using standard

instructions and addressing modes.

When an SPI transfer occurs data is transmitted and received simultaneously. A serial clock

line synchronizes shifting and sampling of the information on the two serial data lines. A slave

select line allows individual selection of a slave device. The central elements in the BSPI

system are the 16-bit shift register and the read data buffer which is 16 words x 16-bit.A

BSPI-DMA interface is also present to allow for data to be transferred to/from memory using

the DMA.A block diagram of the BSPI is shown in Figure 23 on page 187.

STR720 Arkusz danych(PDF) 186 Page - STMicroelectronics

STR720 Arkusz danych(HTML) 186 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

Arkusz danych Pobierz

Link URL