MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 309
MC68HC708AS48
Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
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18.13.5 V
18.14 I/O Registers
MC68HC708AS48
MOTOROLA
SS
(Clock Ground)
—
Rev. 4.0
The CPU can always read the state of the SS pin by configuring the
appropriate pin as an input and reading the data register.
(See
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:
X = don’t care
SPE SPMSTR MODFEN
SS
0
1
1
1
•
•
•
is the ground return for the serial clock pin, SPSCK, and the ground
Table
SPI control register (SPCR, $0010)
SPI status and control register (SPSCR, $0011)
SPI data register (SPDR, $0012)
X
0
1
1
Serial Peripheral Interface (SPI)
18-4.)
SS
pin.
X
X
0
1
Table 18-4. 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
309
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