MC9S08GB32 Motorola, MC9S08GB32 Datasheet - Page 190
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MC9S08GB32
Manufacturer Part Number
MC9S08GB32
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC9S08GB32.pdf
(290 pages)
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Serial Peripheral Interface (SPI) Module
The most common uses of the SPI system include connecting simple shift registers for adding input or
output ports or connecting small peripheral devices such as serial A/D or D/A converters. Although
Figure 12-2
simpler connections where data is unidirectionally transferred from the master MCU to a slave or from a
slave to the master MCU.
12.2.2
Figure 12-3
Data is written to the double-buffered transmitter (write to SPI1D) and gets transferred to the SPI shift
register at the start of a data transfer. After shifting in a byte of data, the data is transferred into the
double-buffered receiver where it can be read (read from SPI1D). Pin multiplexing logic controls
connections between MCU pins and the SPI module.
When the SPI is configured as a master, the clock output is routed to the SPSCK1 pin, the shifter output is
routed to MOSI1, and the shifter input is routed from the MISO1 pin.
When the SPI is configured as a slave, the SPSCK1 pin is routed to the clock input of the SPI, the shifter
output is routed to MISO1, and the shifter input is routed from the MOSI1 pin.
In the external SPI system, simply connect all SPSCK pins to each other, all MISO pins together, and all
MOSI pins together. Peripheral devices often use slightly different names for these pins.
190
SPI Module Block Diagram
shows a system where data is exchanged between two MCUs, many practical systems involve
is a block diagram of the SPI module. The central element of the SPI is the SPI shift register.
MC9S08GB/GT Data Sheet, Rev. 2.3
Freescale Semiconductor
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