RM0312 datasheet(210/275 Pages) STMICROELECTRONICS

210 / 275 page

Serial peripheral interface (SPI)

RM0312

210/275

DocID022352 Rev 3

Figure 75. TXE/RXNE/BSY behavior in full duplex mode (RXONLY = 0).

Case of continuous transfers

Figure 76. TXE/RXNE/BSY behavior in slave / full duplex mode

(BDM = 0, RXONLY = 0). Case of continuous transfers

MISO/MOSI (in)

Tx Buffer

DATA1 = 0xA1

TXE flag

0xF2

BSY flag

0xF3

software

writes 0xF1

in SPI_DR

software waits

until TXE=1 and

writes 0xF2 in

SPI_DR

software waits

until RXNE=1

and reads 0xA1

from SPI_DR

set by hw

cleared by sw

set by hw

cleared by sw

set by hw

SCK

DATA 2 = 0xA2

DATA 3 = 0xA3

reset by hw

Example in Master Mode with CPOL=1, CPHA=1

0xF1

RXNE flag

(write SPI_DR)

Rx Buffer

set by hw

cleared by sw

MISO/MOSI (out)

DATA1 = 0xF1

DATA2 = 0xF2

DATA3 = 0xF3

(read SPI_DR)

0xA1

0xA2

0xA3

software waits until

TXE=1 and writes

0xF3 in 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

0xF1

set by hw

MISO/MOSI (in)

Tx Buffer

DATA 1 = 0xA1

TXE flag

0xF2

BSY flag

0xF3

software

writes 0xF1

in SPI_DR

software waits

until TXE=1 and

writes 0xF2 in

SPI_DR

software waits

until RXNE=1

and reads 0xA1

from SPI_DR

set by hw

cleared by sw

set by hw

cleared by sw

set by hw

SCK

DATA 2 = 0xA2

DATA 3 = 0xA3

reset by hw

Example in Slave Mode with CPOL=1, CPHA=1

RXNE flag

(write SPI_DR)

Rx Buffer

set by hw

cleared by sw

MISO/MOSI (out)

DATA 1 = 0xF1

DATA 2 = 0xF2

DATA 3 = 0xF3

(read SPI_DR)

0xA1

0xA2

0xA3

software waits

until TXE=1 and

writes 0xF3 in

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

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