mc68hc11f1cpu5 Freescale Semiconductor, Inc, mc68hc11f1cpu5 Datasheet - Page 49

• Manufacturer Part Number: mc68hc11f1cpu5
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

10 Serial Peripheral Interface
10.1 SPI Block Diagram
MC68HC11F1/FC0
MC68HC11FTS/D
The serial peripheral interface (SPI) allows the MCU to communicate synchronously with peripheral de-
vices and other microprocessors. The SPI protocol facilitates rapid exchange of serial data between de-
vices in a control system. The MC68HC11F1 and MC68HC11FC0 can be set up for master or slave
operation. Standard data rates can be as high as one half of the E-clock rate when configured as mas-
ter, and as fast as the E-clock when configured as slave.
The MC68HC11FC0 has an additional control bit that allows the SPI baud rate counter to be bypassed.
This allows a master mode baud rate equal to the E-clock frequency.
MCU CLOCK
INTERNAL
PRESENT ON MC68HC11FC0 ONLY
DOTTED LINE CONNECTIONS
SPIE
SPE
DWOM
MSTR
CPHA
CPOL
SPR1
SPR0
SPRBYP
16
32
2
4
Figure 12 SPI Block Diagram
SPR0
SPR1
SPI STATUS REGISTER
MSB
8-BIT SHIFT REGISTER
READ DATA BUFFER
CLOCK LOGIC
MSTR
SPIE
SPE
CONTROL
SPI
LSB
SPI INTERRUPT
M
M
S
S
M
S
REQUEST
MOTOROLA
MOSI
MISO
SCK
PD5
PD4
PD3
PD2
SS
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