CM68HC05C4ACFB Motorola / Freescale Semiconductor, CM68HC05C4ACFB Datasheet - Page 90

• Manufacturer Part Number: CM68HC05C4ACFB
• Description: Microcontroller
• Manufacturer: Motorola / Freescale Semiconductor

Serial Peripheral Interface (SPI)
10.6.3 Serial Peripheral Data I/O Register
General Release Specification
90
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.
Serial Peripheral Interface (SPI)
MC68HC05C4A
MOTOROLA
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Rev. 4.0