參數(shù)資料
型號: MC68HC11F1CFN3
廠商: Freescale Semiconductor
文件頁數(shù): 158/158頁
文件大小: 0K
描述: IC MCU 512 EEPROM 3MHZ 68-PLCC
標(biāo)準(zhǔn)包裝: 18
系列: HC11
核心處理器: HC11
芯體尺寸: 8-位
速度: 3MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 30
程序存儲器類型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.75 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 68-LCC(J 形引線)
包裝: 管件
SERIAL PERIPHERAL INTERFACE
TECHNICAL DATA
8-1
SECTION 8 SERIAL PERIPHERAL INTERFACE
The serial peripheral interface (SPI), an independent serial communications sub-
system, allows the MCU to communicate synchronously with peripheral devices, such
as transistor-transistor logic (TTL) shift registers, liquid crystal display (LCD) drivers,
analog-to-digital converter subsystems, and other microprocessors. The SPI is also
capable of inter-processor communication in a multiple master system. The SPI sys-
tem can be configured as either a master or a slave device. When configured as a
master, data transfer rates can be as high as one-half the E-clock rate (2.5 Mbits per
second for a 5-MHz bus frequency). When configured as a slave, data transfers can
be as fast as the E-clock rate (5 Mbits per second for a 5-MHz bus frequency).
8.1 Functional Description
The central element in the SPI system is the block containing the shift register and the
read data buffer. The system is single buffered in the transmit direction and double
buffered in the receive direction. This means that new data for transmission cannot be
written to the shifter until the previous transfer is complete; however, received data is
transferred into a parallel read data buffer so the shifter is free to accept a second se-
rial character. As long as the first character is read out of the read data buffer before
the next serial character is ready to be transferred, no overrun condition occurs. A sin-
gle MCU register address is used for reading data from the read data buffer and for
writing data to the shifter.
The SPI status block represents the SPI status flags (transfer complete, write collision,
and mode fault) located in the SPI status register (SPSR). The SPI control block rep-
resents those functions that control the SPI system through the serial peripheral con-
trol register (SPCR).
Refer to Figure 8-1, which shows the SPI block diagram.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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