參數(shù)資料
型號： MC68HCL05C9AFN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 3/162頁
文件大?。?/td> 1093K
代理商： MC68HCL05C9AFN
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Serial Peripheral Interface (SPI)
Advance Information
MC68HC05C9A — Rev. 5.0
100
Serial Peripheral Interface (SPI)
MOTOROLA
SPIF set) followed by an access of the SPDR. Following the initial
transfer, unless SPSR is read (with SPIF set) first, attempts to write to
SPDR are inhibited.
WCOL — Write Collision Bit
The write collision bit is set when an attempt is made to write to the
serial peripheral data register while data transfer is taking place. If
CPHA is 0, a transfer is said to begin when SS goes low and the
transfer ends when SS goes high after eight clock cycles on SCK.
When CPHA is 1, a transfer is said to begin the first time SCK
becomes active while SS is low and the transfer ends when the SPIF
flag gets set. Clearing the WCOL bit is accomplished by reading the
SPSR (with WCOL set) followed by an access to SPDR.
MODF — Mode Fault Flag
The mode fault flag indicates that there may have been a multi-master
conflict for system control and allows a proper exit from system
operation to a reset or default system state. The MODF bit is normally
clear, and is set only when the master device has its SS pin pulled
low. Setting the MODF bit affects the internal serial peripheral
interface system in these ways:
1. An SPI interrupt is generated if SPIE = 1.
2. The SPE bit is cleared. This disables the SPI.
3. The MSTR bit is cleared, thus forcing the device into the
slave mode.
Clearing the MODF bit is accomplished by reading the SPSR (with
MODF set), followed by a write to the SPCR. Control bits SPE and
MSTR may be restored by user software to their original state during
this clearing sequence or after the MODF bit has been cleared. It is
also necessary to restore DDRD after a mode fault.
Bits 5 and 3–0 — Not Implemented
These bits always read 0.
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