Datasheet

DocID027107 Rev 6 37/202
STM32F446xC/E Functional overview
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The SDIO Card Specification Version 2.0 is also supported with two different databus
modes: 1-bit (default) and 4-bit.
The current version supports only one SD/SDIO/MMC4.2 card at any one time and a stack
of MMC4.1 or previous.
3.32 Controller area network (bxCAN)
The two CANs are compliant with the 2.0A and B (active) specifications with a bitrate up to 1
Mbit/s. They can receive and transmit standard frames with 11-bit identifiers as well as
extended frames with 29-bit identifiers. Each CAN has three transmit mailboxes, two receive
FIFOS with 3 stages and 28 shared scalable filter banks (all of them can be used even if one
CAN is used). 256 bytes of SRAM are allocated for each CAN.
3.33 Universal serial bus on-the-go full-speed (OTG_FS)
The devices embed an USB OTG full-speed device/host/OTG peripheral with integrated
transceivers. The USB OTG FS peripheral is compliant with the USB 2.0 specification and
with the OTG 1.0 specification. It has software-configurable endpoint setting and supports
suspend/resume. The USB OTG full-speed controller requires a dedicated 48 MHz clock
that is generated by a PLL connected to the HSE oscillator. The USB has dedicated power
rails allowing its use throughout the entire power range. The major features are:
• Combined Rx and Tx FIFO size of 320 × 35 bits with dynamic FIFO sizing
• Supports the session request protocol (SRP) and host negotiation protocol (HNP)
• 6 bidirectional endpoints
• 12 host channels with periodic OUT support
• HNP/SNP/IP inside (no need for any external resistor)
• For OTG/Host modes, a power switch is needed in case bus-powered devices are
connected
3.34 Universal serial bus on-the-go high-speed (OTG_HS)
The devices embed a USB OTG high-speed (up to 480 Mb/s) device/host/OTG peripheral.
The USB OTG HS supports both full-speed and high-speed operations. It integrates the
transceivers for full-speed operation (12
MB/s) and features a UTMI low-pin interface (ULPI)
for high-speed operation (480
MB/s). When using the USB OTG HS in HS mode, an
external PHY device connected to the ULPI is required.
The USB OTG HS peripheral is compliant with the USB 2.0 specification and with the OTG
1.0 specification. It has software-configurable endpoint setting and supports
suspend/resume. The USB OTG full-speed controller requires a dedicated 48
MHz clock
that is generated by a PLL connected to the HSE oscillator. The USB has dedicated power
rails allowing its use throughout the entire power range.
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