Serial Peripheral Interface (Spi) / Inter-Integrated Sound Interface (I 2 S); High-Definition Multimedia Interface (Hdmi) - Consumer; Electronics Control (Cec); Controller Area Network (Can) - STMicroelectronics STM32F042F4 Manual

Functional overview
Modbus communication
Auto baud rate detection
Driver Enable
1. X = supported.
3.16 Serial peripheral interface (SPI) / Inter-integrated sound
interface (I
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.
One standard I
can operate as master or slave at half-duplex communication mode. It can be configured to
transfer 16 and 24 or 32 bits with 16-bit or 32-bit data resolution and synchronized by a
specific signal. Audio sampling frequency from 8 kHz up to 192 kHz can be set by an 8-bit
programmable linear prescaler. When operating in master mode, it can output a clock for an
external audio component at 256 times the sampling frequency.
Hardware CRC calculation
Rx/Tx FIFO
NSS pulse mode
2
I S mode
TI mode
1. X = supported.
3.17

High-definition multimedia interface (HDMI) - consumer

electronics control (CEC)

The device embeds a HDMI-CEC controller that provides hardware support for the
Consumer Electronics Control (CEC) protocol (Supplement 1 to the HDMI standard).
This protocol provides high-level control functions between all audiovisual products in an
environment. It is specified to operate at low speeds with minimum processing and memory
overhead. It has a clock domain independent from the CPU clock, allowing the HDMI_CEC
controller to wakeup the MCU from Stop mode on data reception.
3.18

Controller area network (CAN)

The CAN is compliant with specifications 2.0A and B (active) with a bit rate up to 1 Mbit/s. It
can receive and transmit standard frames with 11-bit identifiers as well as extended frames
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Table 10. STM32F042x4/x6 USART implementation (continued)
USART modes/features
2
S)
2
S interface (multiplexed with SPI1) supporting four different audio standards

Table 11. STM32F042x4/x6 SPI/I

(1)
SPI features
DocID025832 Rev 5
(1)
2
S implementation
STM32F042x4 STM32F042x6
USART1 USART2
X
X
X
SPI1 SPI2
X
X
X
X
X
-
-
X
X
X
X
-
X