參數(shù)資料
型號： MC68711E20VFNE2
廠商： Freescale Semiconductor
文件頁數(shù)： 114/138頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 52-PLCC
標(biāo)準(zhǔn)包裝： 23
系列： HC11
核心處理器： HC11
芯體尺寸： 8-位
速度： 4MHz
連通性： SCI，SPI
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 38
程序存儲器容量： 20KB（20K x 8）
程序存儲器類型： OTP
EEPROM 大?。?/td> 512 x 8
RAM 容量： 768 x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 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 ~ 105°C
封裝/外殼： 52-LCC（J 形引線）
包裝： 管件
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
77
Chapter 7
Serial Peripheral Interface (SPI)
7.1 Introduction
The serial peripheral interface (SPI), an independent serial communications subsystem, allows the
microcontroller unit (MCU) to communicate synchronously with peripheral devices, such as:
Transistor-transistor logic (TTL) shift registers
Liquid crystal diode (LCD) display drivers
Analog-to-digital converter (ADC) subsystems
Other microprocessors (MCUs)
The SPI is also capable of inter-processor communication in a multiple master system. The SPI system
can be configured as either a master or a slave device with data rates as high as one half of the E-clock
rate when configured as master, and as fast as the E-clock rate when configured as slave.
7.2 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 serial 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 single 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 functions (transfer complete, write collision, and mode
fault) performed by the serial peripheral status register (SPSR). The SPI control block represents those
functions that control the SPI system through the serial peripheral control register (SPCR).
Refer to Figure 7-1, which shows the SPI block diagram.
7.3 SPI Transfer Formats
During an SPI transfer, data is simultaneously transmitted and received. 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 SPI device; slave devices that are not selected do not interfere with SPI bus activities.
On a master SPI device, the select line can optionally be used to indicate a multiple master bus
contention. Refer to Figure 7-2.
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