參數(shù)資料
型號： TMS320F2812PGFMEP
廠商： Texas Instruments, Inc.
元件分類： 數(shù)字信號處理
英文描述： Digital Signal Processors
中文描述： 數(shù)字信號處理器
文件頁數(shù)： 78/159頁
文件大?。?/td> 2084K
代理商： TMS320F2812PGFMEP
Peripherals
78
March 2004 Revised October 2004
SGUS051A
4.7
Serial Peripheral Interface (SPI) Module
The F281x and C281x devices include the four-pin serial peripheral interface (SPI) module. The SPI is a
high-speed, synchronous serial I/O port that allows a serial bit stream of programmed length (one to sixteen
bits) to be shifted into and out of the device at a programmable bit-transfer rate. Normally, the SPI is used for
communications between the DSP controller and external peripherals or another processor. Typical
applications include external I/O or peripheral expansion through devices such as shift registers, display
drivers, and ADCs. Multidevice communications are supported by the master/slave operation of the SPI.
The SPI module features include:
Four external pins:
SPISOMI: SPI slave-output/master-input pin
SPISIMO: SPI slave-input/master-output pin
SPISTE: SPI slave transmit-enable pin
SPICLK: SPI serial-clock pin
NOTE: All four pins can be used as GPIO, if the SPI module is not used.
Two operational modes: master and slave
Baud rate: 125 different programmable rates
Baud rate =
LSPCLK
(SPIBRR
LSPCLK
4
1) , when BRR
≠
0
when BRR = 0, 1, 2, 3
=
,
Serial port performance is limited by I/O buffer switching speed. Internal prescalers must be adjusted
such that the peripheral speed is less than the I/O buffer speed limit—20 MHz maximum.
Data word length: one to sixteen data bits
Four clocking schemes (controlled by clock polarity and clock phase bits) include:
Falling edge without phase delay: SPICLK active-high. SPI transmits data on the falling edge of the
SPICLK signal and receives data on the rising edge of the SPICLK signal.
Falling edge with phase delay: SPICLK active-high. SPI transmits data one half-cycle ahead of the
falling edge of the SPICLK signal and receives data on the falling edge of the SPICLK signal.
Rising edge without phase delay: SPICLK inactive-low. SPI transmits data on the rising edge of the
SPICLK signal and receives data on the falling edge of the SPICLK signal.
Rising edge with phase delay: SPICLK inactive-low. SPI transmits data one half-cycle ahead of the
falling edge of the SPICLK signal and receives data on the rising edge of the SPICLK signal.
Simultaneous receive and transmit operation (transmit function can be disabled in software)
Transmitter and receiver operations are accomplished through either interrupt-driven or polled
algorithms.
Nine SPI module control registers: Located in control register frame beginning at address 7040h.
NOTE:
register is accessed, the register data is in the lower byte (70), and the upper byte (158) is read as
zeros. Writing to the upper byte has no effect.
All registers in this module are 16-bit registers that are connected to Peripheral Frame 2. When a
Enhanced feature:
16-level transmit/receive FIFO
Delayed transmit control
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TMS320F2812PGFQ 制造商:Texas Instruments 功能描述:Digital Signal Processor
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TMS320F2812ZHHA 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 32-Bit Digital Sig Controller w/Flash RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
TMS320F2812ZHHAR 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 32B DIGITAL SIGNAL CONTROLLER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
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