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參數(shù)資料
| 型號： | MCCF68HC08LK60 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, UUC150 |
| 封裝： | 0.226 X 0.242 INCH, BUMP, WAFER-150 |
| 文件頁數(shù)： | 66/248頁 |
| 文件大?。?/td> | 1727K |
| 代理商： | MCCF68HC08LK60 |
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Serial Peripheral Interface Module (SPI)
MC68HC08LK60 MC68HC908LK60 Advance Information Data Sheet, Rev. 1.1
158
Freescale Semiconductor
In a master SPI with the mode fault enable bit (MODFEN) set, the mode fault flag (MODF) is set if SS
goes to logic 0. A mode fault in a master SPI causes the following events to occur:
If ERRIE = 1, the SPI generates an SPI receiver/error CPU interrupt request.
The SPE bit is cleared.
The SPTE bit is set.
The SPI state counter is cleared.
When configured as a slave (SPMSTR = 0), the MODF flag is set if SS goes high during a transmission.
When CPHA = 0, a transmission begins when SS goes low and ends once the incoming SPSCK goes
back to its idle level following the shift of the eighth data bit. When CPHA = 1, the transmission begins
when the SPSCK leaves its idle level and SS is already low. The transmission continues until the SPSCK
returns to its idle level following the shift of the last data bit. (See 13.5 Transmission Formats.)
NOTE
Setting the MODF flag does not clear the SPMSTR bit. The SPMSTR bit
has no function when SPE = 0. Reading SPMSTR when MODF = 1 shows
the difference between a MODF occurring when the SPI is a master and
when it is a slave.
NOTE
When CPHA = 0, a MODF occurs if a slave is selected (SS is at logic 0) and
later unselected (SS is at logic 1) even if no SPSCK is sent to that slave.
This happens because SS at logic 0 indicates the start of the transmission
(MISO driven out with the value of MSB) for CPHA = 0. When CPHA = 1, a
slave can be selected and then later unselected with no transmission
occurring. Therefore, MODF does not occur since a transmission was
never begun.
In a slave SPI (MSTR = 0), the MODF bit generates an SPI receiver/error CPU interrupt request if the
ERRIE bit is set. The MODF bit does not clear the SPE bit or reset the SPI in any way. Software can abort
the SPI transmission by clearing the SPE bit of the slave.
NOTE
A logic 1 voltage on the SS pin of a slave SPI puts the MISO pin in a high
impedance state. Also, the slave SPI ignores all incoming SPSCK clocks,
even if it was already in the middle of a transmission.
To clear the MODF flag, read the SPSCR with the MODF bit set and then write to the SPCR register. This
entire clearing mechanism must occur with no MODF condition existing or else the flag is not cleared.
13.8 Interrupts
The four SPI status flags that can be enabled to generate CPU interrupt requests are discussed in
Reading the SPI status and control register with SPRF set and then reading the receive data register
clears SPRF. The clearing mechanism for the SPTE flag is always just a write to the transmit data register.
The SPI transmitter interrupt enable bit (SPTIE) enables the SPTE flag to generate transmitter interrupt
requests provided that the SPI is enabled (SPE = 1).
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