參數(shù)資料
型號: MC68HC05C12ACFN
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): 147/156頁
文件大?。?/td> 756K
代理商: MC68HC05C12ACFN
NON-DISCLOSURE
AGREEMENT
REQUIRED
Serial Peripiheral Interface (SPI)
General Release Specification
MC68HC05C12A Rev. 3.0
90
Serial Peripiheral Interface (SPI)
MOTOROLA
10.6.3 Serial Peripheral Data I/O Register
The serial peripheral data I/O register is used to transmit and receive
data on the serial bus. Only a write to this register will initiate
transmission/reception of another byte, and this will occur only in the
master device. At the completion of transmitting a byte of data, the SPIF
status bit is set in both the master and slave devices.
When the user reads the serial peripheral data I/O register, a buffer is
actually being read. The first SPIF must be cleared by the time a second
transfer of the data from the shift register to the read buffer is initiated or
an overrun condition will exist. In cases of overrun, the byte which
causes the overrun is lost.
A write to the serial peripheral data I/O register is not buffered and
places data directly into the shift register for transmission.
Address:
$000C
Bit 7
654321
Bit 0
Read:
SPD7
SPD6
SPD5
SPD4
SPD3
SPD2
SPD1
SPD0
Write:
Reset
Unaffected by Reset
Figure 10-6. SPI Data Register (SPSR)
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