参数资料
型号: ST7FLITES5Y0U6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, QCC20
封装: QFN-20
文件页数: 85/124页
文件大小: 2155K
代理商: ST7FLITES5Y0U6
ST7LITE0xY0, ST7LITESxY0
63/124
SERIAL PERIPHERAL INTERFACE (Cont’d)
11.3.4 Clock Phase and Clock Polarity
Four possible timing relationships may be chosen
by software, using the CPOL and CPHA bits (See
Note: The idle state of SCK must correspond to
the polarity selected in the SPICSR register (by
pulling up SCK if CPOL=1 or pulling down SCK if
CPOL=0).
The combination of the CPOL clock polarity and
CPHA (clock phase) bits selects the data capture
clock edge
Figure 41, shows an SPI transfer with the four
combinations of the CPHA and CPOL bits. The di-
agram may be interpreted as a master or slave
timing diagram where the SCK pin, the MISO pin,
the MOSI pin are directly connected between the
master and the slave device.
Note: If CPOL is changed at the communication
byte boundaries, the SPI must be disabled by re-
setting the SPE bit.
Figure 41. Data Clock Timing Diagram
SCK
MSBit
Bit 6
Bit 5
Bit 4
Bit3
Bit 2
Bit 1
LSBit
MSBit
Bit 6
Bit 5
Bit 4
Bit3Bit 2Bit 1
LSBit
MISO
(from master)
MOSI
(from slave)
SS
(to slave)
CAPTURE STROBE
CPHA =1
MSBit
Bit 6
Bit 5
Bit 4
Bit3
Bit 2
Bit 1
LSBit
MSBit
Bit 6
Bit 5
Bit 4
Bit3
Bit 2
Bit 1
LSBit
MISO
(from master)
MOSI
SS
(to slave)
CAPTURE STROBE
CPHA =0
Note: This figure should not be used as a replacement for parametric information.
Refer to the Electrical Characteristics chapter.
(from slave)
(CPOL = 1)
SCK
(CPOL = 0)
SCK
(CPOL = 1)
SCK
(CPOL = 0)
1
相关PDF资料
PDF描述
ST7FLITES2Y0B6 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDIP16
ST7FLITES5Y0M6TRE 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
ST7FLITE05Y0M6TR 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
ST7FLITE05Y0U6 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, QCC20
ST7FLITE09Y0M6TR 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
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