MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 309

no-image

MC68HC708AS48

Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
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

Related parts for MC68HC708AS48