參數(shù)資料
型號: ST7PDALIF2M6
廠商: 意法半導體
元件分類: ADC
英文描述: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
中文描述: 8位單電壓閃存存儲器,數(shù)據(jù)EEPROM,模數(shù)轉換器,定時器,SPI和大理微控制器
文件頁數(shù): 83/141頁
文件大小: 2175K
代理商: ST7PDALIF2M6
ST7DALI
83/141
SERIAL PERIPHERAL INTERFACE
(Cont’d)
11.5.4 Clock Phase and Clock Polarity
Four possible timing relationships may be chosen
by software, using the CPOL and CPHA bits (See
Figure 49
).
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 49
, 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 49. Data Clock Timing Diagram
SCK
(CPOL = 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
(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
(from slave)
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.
SCK
(CPOL = 0)
SCK
(CPOL = 1)
SCK
(CPOL = 0)
1
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