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STM32F070xB STM32F070x6 Functional overview
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3.15  Serial peripheral interface (SPI)
Up to two SPIs are able to communicate up to 18 Mbit/s in slave and master modes in full-
duplex and half-duplex communication modes. The 3-bit prescaler gives 8 master mode 
frequencies and the frame size is configurable from 4 bits to 16 bits. 
SPI1 and SPI2 are identical and implement the set of features shown in the following table.
 
3.16  Universal serial bus (USB)
The STM32F070xB/6 embeds a full-speed USB device peripheral compliant with the USB 
specification version 2.0. The internal USB PHY supports USB FS signaling, embedded DP 
pull-up and also battery charging detection according to Battery Charging Specification 
Revision 1.2. The USB interface implements a full-speed (12 Mbit/s) function interface with 
added support for USB 2.0 Link Power Management. It has software-configurable endpoint 
setting with packet memory up-to 1 KB and suspend/resume support. It requires a precise 
48 MHz clock which can be generated from the internal main PLL (the clock source must 
use an HSE crystal oscillator).
3.17  Serial wire debug port (SW-DP)
An ARM SW-DP interface is provided to allow a serial wire debugging tool to be connected 
to the MCU.
Table 9. STM32F070xB/6 SPI implementation 
SPI features
(1)
1. X = supported.
SPI1 SPI2
(2)
2. Available on STM32F070xB only.
Hardware CRC calculation X X
Rx/Tx FIFO X X
NSS pulse mode X X
TI mode X X
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