參數(shù)資料
型號: ST7FL09Y0MBE
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
封裝: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-16
文件頁數(shù): 58/104頁
文件大?。?/td> 2151K
代理商: ST7FL09Y0MBE
Obsolete
Product(s)
- Obsolete
Product(s)
ST7L05, ST7L09
57/104
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 35, 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 when 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 35. 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
Bit3
Bit 2
Bit 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
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