MC68HC912DG128A MOTOROLA [Motorola, Inc], MC68HC912DG128A Datasheet - Page 235
MC68HC912DG128A
Manufacturer Part Number
MC68HC912DG128A
Description
microcontroller unit 16BIT DEVICE
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912DG128A.pdf
(404 pages)
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Serial Peripheral Interface (SPI)
13-msi
MOTOROLA
R8 — Receive Bit 8
T8 — Transmit Bit 8
R7/T7–R0/T0 — Receive/Transmit Data Bits 7 to 0
The serial peripheral interface allows the MC68HC912DT128A to
communicate synchronously with peripheral devices and other
microprocessors. The SPI system in the MC68HC912DT128A can
operate as a master or as a slave. The SPI is also capable of
interprocessor communications in a multiple master system.
When the SPI is enabled, all pins that are defined by the configuration
as inputs will be inputs regardless of the state of the DDRS bits for those
pins. All pins that are defined as SPI outputs will be outputs only if the
DDRS bits for those pins are set. Any SPI output whose corresponding
DDRS bit is cleared can be used as a general-purpose input.
A bidirectional serial pin is possible using the DDRS as the direction
control.
Read anytime. Write has no meaning or affect.
This bit is the ninth serial data bit received when the SCI system is
configured for nine-data-bit operation.
Read or write anytime.
This bit is the ninth serial data bit transmitted when the SCI system is
configured for nine-data-bit operation. When using 9-bit data format
this bit does not have to be written for each data word. The same
value will be transmitted as the ninth bit until this bit is rewritten.
Reads access the eight bits of the read-only SCI receive data register
(RDR). Writes access the eight bits of the write-only SCI transmit data
register (TDR). SCxDRL:SCxDRH form the 9-bit data word for the
SCI. If the SCI is being used with a 7- or 8-bit data word, only SCxDRL
needs to be accessed. If a 9-bit format is used, the upper register
should be written first to ensure that it is transferred to the transmitter
shift register with the lower register.
Multiple Serial Interface
Serial Peripheral Interface (SPI)
MC68HC912DT128A Rev 2.0
Multiple Serial Interface
235
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