STM32W108HB datasheet(107/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

Serial interfaces

Doc ID 16252 Rev 14

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SPI - Master

SC1MOSI alternate

output (push-pull)

SC1MISO input

SC1SCLK alternate

output (push-pull);

special SCLK mode

(not used)

SPI - Slave

SC1MISO alternate

output (push-pull)

SC1MOSI input

SC1SCLK input

SC1nSSEL input

I2C - Master

SC1SDA alternate

output (open-drain)

SC1SCL alternate

output (open-drain)

(not used)

UART

TXD alternate

output (push-pull)

RXD input

nCTS input (1)

nRTS alternate

output (push-pull)

(1)

SPI - Master

SC2MOSI

Alternate Output

(push-pull)

SC2MISO Input

SC2SCLK

Alternate Output

(push-pull), special

SCLK mode

(not used)

SPI - Slave

SC2MOSI

Alternate Output

(push-pull)

SC2MISO Input

SC2SCLK Input

SC2nSSEL Input

I2C - Master

(not used)

SC2SDA Alternate

Output (open-drain)

SC2SCL Alternate

Output (open-drain)

(not used)

9.3

SPI master mode

The SPI master controller has the following features:

●

Full duplex operation

●

Programmable clock frequency (6 MHz max. for STM32W108xB and 12 MHz max for

STM32W108CC and STM32W108CZ)

●

Programmable clock polarity and phase

●

Selectable data shift direction (either LSB or MSB first)

●

Receive and transmit FIFOs

●

Receive and transmit DMA channels

The SPI master controller uses the three signals:

●

MOSI (Master Out, Slave In) - outputs serial data from the master

●

MISO (Master In, Slave Out) - inputs serial data from a slave

●

SCLK (Serial Clock) - outputs the serial clock used by MOSI and MISO

The GPIO pins used for these signals are shown in Table 21. Additional outputs may be

needed to drive the nSSEL signals on slave devices.

Table 19.

SC1 GPIO usage and configuration

Interface

PB1

PB2

PB3

PB4

used if RTS/CTS hardware flow control is enabled.

Table 20.

SC2 GPIO usage and configuration

Interface

PA0

PA1

PA2

PA3

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