MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 271

• Manufacturer Part Number: MC68HC908AZ32ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

17.13.5 V
17.14 I/O Registers
17.14.1 SPI Control Register
68HC908AZ32A — Rev 0.0
MOTOROLA
SS
(Clock Ground)
V
for the port output buffers. To reduce the ground return path loop and
minimize radio frequency (RF) emissions, connect the ground pin of the
slave to the V
Three registers control and monitor SPI operation:
The SPI control register:
X = don’t care
SPE SPMSTR MODFEN
SS
0
1
1
1
Freescale Semiconductor, Inc.
•
•
•
•
•
•
•
is the ground return for the serial clock pin, SPSCK, and the ground
For More Information On This Product,
SPI control register (SPCR $0010)
SPI status and control register (SPSCR $0011)
SPI data register (SPDR $0012)
Enables SPI module interrupt requests
Selects CPU interrupt requests
Configures the SPI module as master or slave
Selects serial clock polarity and phase
X
0
1
1
Serial Peripheral Interface (SPI)
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SS
pin.
X
X
0
1
Table 17-5. SPI Configuration
Master without MODF
SPI Configuration
Master with MODF
Not Enabled
Slave
Serial Peripheral Interface (SPI)
General-Purpose I/O;
General-Purpose I/O;
State of SS Logic
SS Ignored by SPI
SS Ignored by SPI
Input-Only to SPI
Input-Only to SPI
Advance Information
I/O Registers
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