Datasheet

Description STM32F103xC, STM32F103xD, STM32F103xE
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mode, the master clock can be output to the external DAC/CODEC at 256 times the
sampling frequency.
2.3.22 SDIO
An SD/SDIO/MMC host interface is available, that supports MultiMediaCard System
Specification Version 4.2 in three different databus modes: 1-bit (default), 4-bit and 8-bit.
The interface allows data transfer at up to 48 MHz in 8-bit mode, and is compliant with SD
Memory Card Specifications Version 2.0.
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.
In addition to SD/SDIO/MMC, this interface is also fully compliant with the CE-ATA digital
protocol Rev1.1.
2.3.23 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
with 29-bit identifiers. It has three transmit mailboxes, two receive FIFOs with 3 stages and
14 scalable filter banks.
2.3.24 Universal serial bus (USB)
The STM32F103xC, STM32F103xD and STM32F103xE performance line embed a USB
device peripheral compatible with the USB full-speed 12 Mbs. The USB interface
implements a full-speed (12 Mbit/s) function interface. It has software-configurable endpoint
setting and suspend/resume support. The dedicated 48 MHz clock is generated from the
internal main PLL (the clock source must use a HSE crystal oscillator).
2.3.25 GPIOs (general-purpose inputs/outputs)
Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as
input (with or without pull-up or pull-down) or as peripheral alternate function. Most of the
GPIO pins are shared with digital or analog alternate functions. All GPIOs are high current-
capable.
The I/Os alternate function configuration can be locked if needed following a specific
sequence in order to avoid spurious writing to the I/Os registers.
2.3.26 ADC (analog to digital converter)
Three 12-bit analog-to-digital converters are embedded into STM32F103xC, STM32F103xD
and STM32F103xE performance line devices and each ADC shares up to 21 external
channels, performing conversions in single-shot or scan modes. In scan mode, automatic
conversion is performed on a selected group of analog inputs.
Additional logic functions embedded in the ADC interface allow:
● Simultaneous sample and hold
● Interleaved sample and hold
● Single shunt