mc68hc11d0 Freescale Semiconductor, Inc, mc68hc11d0 Datasheet - Page 80

• Manufacturer Part Number: mc68hc11d0
• Description: Mc68hc11d0 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

8.2 SPI Transfer Formats
8-2
During an SPI transfer, data is simultaneously transmitted and received. A serial clock
line synchronizes shifting and sampling of the information on the two serial data lines.
A slave select line allows individual selection of a slave SPI device; slave devices that
are not selected do not interfere with SPI bus activities. On a master SPI device, the
select line can optionally be used to indicate a multiple master bus contention. Refer
to Figure 8-2.
÷2
SPI STATUS REGISTER
MCU CLOCK
INTERNAL
DIVIDER
÷4
SELECT
÷16 ÷32
SPI CONTROL
SPI CLOCK (MASTER)
SPI INTERRUPT
REQUEST
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 8-1 SPI Block Diagram
SERIAL PERIPHERAL INTERFACE
8
MSTR
SPE
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DATA BUS
INTERNAL
MSB
8
8/16-BIT SHIFT REGISTER
READ DATA BUFFER
8
SPI CONTROL REGISTER
CLOCK
LOGIC
LSB
CLOCK
S
M
M
S
S
M
TECHNICAL DATA
11 SPI BLOCK
MISO
MOSI
SCK
PD2
PD3
PD4
PD5
SS