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參數(shù)資料
| 型號： | MC68HC05C9AMFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 90/124頁 |
| 文件大?。?/td> | 774K |
| 代理商： | MC68HC05C9AMFN |
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Serial Peripheral Interface (SPI)
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
68
Freescale Semiconductor
In a slave mode, the slave select start logic receives a logic low at the SS pin and a clock at the SCK pin.
Thus, the slave is synchronized with the master. Data from the master is received serially at the MOSI
line and loads the 8-bit shift register. After the 8-bit shift register is loaded, its data is parallel transferred
to the read buffer. During a write cycle, data is written into the shift register, then the slave waits for a clock
train from the master to shift the data out on the slave’s MISO line.
Figure 10-3 illustrates the MOSI, MISO, SCK, and SS master-slave interconnections.
Figure 10-3. Serial Peripheral Interface
Master-Slave Interconnection
10.5 SPI Registers
This subsection describes the three registers in the SPI which provide control, status, and data storage
functions. These registers are:
Serial peripheral control register (SPCR)
Serial peripheral status register (SPSR)
Serial peripheral data I/O register (SPDR)
10.5.1 Serial Peripheral Control Register
The SPI control register (SPCR), shown in Figure 10-4, controls these functions:
Enables SPI interrupts
Enables the SPI system
Selects between standard CMOS or open drain outputs for port D
Selects between master mode and slave mode
Controls the clock/data relationship between master and slave
Determines the idle level of the clock pin
Address:
$000A
Bit 7
654321
Bit 0
Read:
SPIE
SPE
DWOM
MSTR
CPOL
CPHA
SPR1
SPR0
Write:
Reset:
000001
U
U = Undetermined
Figure 10-4. SPI Control Register (SPCR)
SPI SHIFT REGISTER
7 6 5 4 3 2 1 0
SPI SHIFT REGISTER
7 6 5 4 3 2 1 0
SPDR ($000C)
PD3/MOSI
PD2/MISO
PD5/SS
PD4/SCK
MASTER MCU
SLAVE MCU
I/O PORT
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05C9AMP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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| MC68HC05C9E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9ECFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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