ST STM32F40 Series User Manual

RM0090 Serial peripheral interface (SPI)
Doc ID 018909 Rev 4 808/1422
Figure 278. TXE/RXNE/BSY behavior in Master / full-duplex mode (BIDIMODE=0 and RXONLY=0)
in the case of continuous transfers
Figure 279. TXE/RXNE/BSY behavior in Slave / full-duplex mode (BIDIMODE=0, RXONLY=0) in the
case of continuous transfers
MISO/MOSI (in)
Tx buffer
DATA1 = 0xA1
TXE flag
0xF2
BSY flag
0xF3
software
writes 0xF1
into SPI_DR
software waits
until TXE=1 and
writes 0xF2 into
SPI_DR
software waits
until RXNE=1
and reads 0xA1
from SPI_DR
set by hardware
cleared by software
set by hardware
cleared by software
set by hardware
set by hardware
SCK
DATA 2 = 0xA2
DATA 3 = 0xA3
reset by hardware
Example in Master mode with CPOL=1, CPHA=1
0xF1
RXNE flag
(write SPI_DR)
Rx buffer
set by hardware
MISO/MOSI (out)
DATA1 = 0xF1 DATA2 = 0xF2
DATA3 = 0xF3
(read SPI_DR)
0xA1
0xA2 0xA3
software waits
until TXE=1 and
writes 0xF3 into
SPI_DR
software waits
until RXNE=1
and reads 0xA2
from SPI_ DR
software waits
until RXNE=1
and reads 0xA3
from SPI_DR
b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b 7
b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b 7
cleared by software
ai17343
0xF1
set by cleared by software
MISO/MOSI (in)
Tx buffer
DATA 1 = 0xA1
TXE flag
0xF2
BSY flag
0xF3
software
writes 0xF1
into SPI_DR
software waits
until TXE=1 and
writes 0xF2 into
SPI_DR
software waits
until RXNE=1
and reads 0xA1
from SPI_DR
set by hardware
cleared by software
set by hardware
cleared by software
set by hardware
SCK
DATA 2 = 0xA2
DATA 3 = 0xA3
reset by hardware
Example in Slave mode with CPOL=1, CPHA=1
RXNE flag
(write to SPI_DR)
Rx buffer
set by hardware
MISO/MOSI (out)
DATA 1 = 0xF1
DATA 2 = 0xF2
DATA 3 = 0xF3
(read from SPI_DR)
0xA1
0xA2 0xA3
software waits
until TXE=1 and
writes 0xF3 into
SPI_DR
software waits
until RXNE=1
and reads 0xA2
from SPI_ DR
software waits
until RXNE=1
and reads 0xA3
from SPI_DR
b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7
b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7
cleared by software
ai17344

ST STM32F40 Series Specifications

General

Brand	ST
Model	STM32F40 Series
Category	Microcontrollers
Language	English