mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 276

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Peripheral Interface Module (SPI)
13.13.5 CGND (Clock Ground)
13.14 I/O Registers
Technical Data
276
CGND is the ground return for the serial clock pin, SPSCK, and the
ground 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 CGND pin of the master.
Three registers control and monitor SPI operation:
SPE
1. X = don’t care
•
•
•
0
1
1
1
SPI control register (SPCR)
SPI status and control register (SPSCR)
SPI data register (SPDR)
Serial Peripheral Interface Module (SPI)
SPMSTR
X
0
1
1
(1)
MODFEN
Table 13-3. SPI Configuration
X
X
0
1
Master without MODF
SPI Configuration
Master with MODF
Not Enabled
Slave
MC68HC708MP16
Freescale Semiconductor
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
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Rev. 3.1