參數(shù)資料
型號： ST72F324B
廠商： 意法半導(dǎo)體
英文描述： 5V Range 8-Bit MCU With 8 TO 32K FLASH/ROM, 10-Bit ADC, 4 Timers, SPI, SCI Interface(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述： 5V范圍內(nèi)的8位8到32K閃存/ ROM，10位ADC，4個計時器，SPI和SCI接口（具有比較方案，國際檢察官聯(lián)合會，嵌套中斷，中華語文研習(xí)所，人事登記的8位微控制器）
文件頁數(shù)： 82/167頁
文件大小： 1641K
代理商： ST72F324B
ST72324B
82/167
1
SERIAL PERIPHERAL INTERFACE
(Cont’d)
10.4.4 Clock Phase and Clock Polarity
Four possible timing relationships may be chosen
by software, using the CPOL and CPHA bits (See
Figure 50
).
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 50
, 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 50. 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)
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