ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 260
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ST92F150-EVAL
Manufacturer Part Number
ST92F150-EVAL
Description
BOARD EVALUATION FOR ST9 SERIES
Manufacturer
STMicroelectronics
Specifications of ST92F150-EVAL
Processor To Be Evaluated
ST90158 and ST92F1x Daughter Board
Interface Type
I2C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
497-2905
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SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont’d)
10.7.6 Register Description
DATA REGISTER (SPDR)
R240 - Read/Write
Register Page: 7
Reset Value: 0000 0000 (00h)
The SPDR register is used to transmit and receive
data on the serial bus. In the master device only a
write to this register will initiate transmission/re-
ception of another byte.
Notes: During the last clock cycle the SPIF bit is
set, a copy of the received data byte in the shift
register is moved to a buffer. When the user reads
the serial peripheral data register, the buffer is ac-
tually being read.
Warning: A write to the SPDR register places data
directly into the shift register for transmission.
A read to the SPDR register returns the value lo-
cated in the buffer and not the content of the shift
register (see
CONTROL REGISTER (SPCR)
R241 - Read/Write
Register Page: 7
Reset Value: 0000 0000 (00h)
Bit 7 = SPIE Serial peripheral interrupt enable.
This bit is set and cleared by software.
0: Interrupt is inhibited
1: An SPI interrupt is generated whenever either
Bit 6 = SPOE Serial peripheral output enable.
This bit is set and cleared by software. It is also
cleared by hardware when, in master mode, SS=0
(see
0: SPI alternate functions disabled (MISO, MOSI
1: SPI alternate functions enabled (MISO, MOSI
260/429
9
SPIE
D7
SPIF or MODF are set in the SPSR register
while the other flag is 0.
and SCK can only work as input)
and SCK can work as input or output depending
on the value of MSTR)
7
7
Section 10.7.4.5 Master Mode
SPOE SPIS MSTR
D6
Figure
D5
121).
D4
CPOL
D3
CPHA
D2
Fault).
SPR1
D1
D0
SPR0
0
0
Note: To use the MISO, MOSI and SCK alternate
functions (input or output), the corresponding I/O
port must be programmed as alternate function
output.
Bit 5 = SPIS Interrupt Selection.
This bit is set and cleared by software.
0: Interrupt source is external interrupt
1: Interrupt source is SPI
Bit 4 = MSTR Master.
This bit is set and cleared by software. It is also
cleared by hardware when, in master mode, SS=0
(see
0: Slave mode is selected
1: Master mode is selected, the function of the
Bit 3 = CPOL Clock polarity.
This bit is set and cleared by software. This bit de-
termines the steady state of the serial Clock. The
CPOL bit affects both the master and slave
modes.
0: The steady state is a low value at the SCK pin.
1: The steady state is a high value at the SCK pin.
Bit 2 = CPHA Clock phase.
This bit is set and cleared by software.
0: The first clock transition is the first data capture
1: The second clock transition is the first capture
Bit 1:0 = SPR[1:0] Serial peripheral rate.
These bits are set and cleared by software. They
select one of four baud rates to be used as the se-
rial clock when the device is a master.
These 2 bits have no effect in slave mode.
Table 49. Serial Peripheral Baud Rate
SCK pin changes from an input to an output and
the functions of the MISO and MOSI pins are re-
versed.
edge.
edge.
INTCLK Clock Divide
Section 10.7.4.5 Master Mode
16
32
2
4
SPR1
0
0
1
1
Fault).
SPR0
0
1
0
1
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