参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 152/157页
文件大小: 2252K
代理商: MCC68HC711D3
Serial Peripheral Interface (SPI)
Data Sheet
MC68HC711D3 — Rev. 2
94
Serial Peripheral Interface (SPI)
MOTOROLA
7.7.3 SPI Data I/O Register
The SPI data I/O register (SPDR) is used when transmitting or receiving data on
the serial bus. Only a write to this register initiates transmission or reception of a
byte, and this only occurs in the master device. At the completion of transferring a
byte of data, the SPIF status bit is set in both the master and slave devices.
A read of the SPDR is actually a read of a buffer. To prevent an overrun and the
loss of the byte that caused the overrun, the first SPIF must be cleared by the time
a second transfer of data from the shift register to the read buffer is initiated.
NOTE:
SPI is double buffered in and single buffered out.
Address:
$002A
Bit 7
654321
Bit 0
Read:
Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
Write:
Reset:
Unaffected by reset
Figure 7-5. SPI Data I/O Register (SPDR)
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