ARM®Cortex™-M3 core with embedded Flash and SRAM

　　The ARM Cortex™-M3 processor is the latest generation of ARM processors for embedded

　　systems. It has been developed to provide a low-cost platform that meets the needs of MCU

　　implementation, with a reduced pin count and low-power consumption, while delivering

　　outstanding computational performance and an advanced system response to interrupts.

　　The ARM Cortex™-M3 32-bit RISC processor features exceptional code-efficiency,

　　delivering the high-performance expected from an ARM core in the memory size usually

　　associated with 8- and 16-bit devices.

　　With its embedded ARM core, STM32F103xC, STM32F103xD and STM32F103xE

　　performance line family is compatible with all ARM tools and software.

　　Figure 1 shows the general block diagram of the device family.

　　2.3.2

　　Embedded Flash memory

　　Up to 512 Kbytes of embedded Flash is available for storing programs and data.

　　2.3.3

　　CRC (cyclic redundancy check) calculation unit

　　The CRC (cyclic redundancy check) calculation unit is used to get a CRC code from a 32-bit

　　data word and a fixed generator polynomial.

　　Among other applications, CRC-based techniques are used to verify data transmission or

　　storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of

　　verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of

　　the software during runtime, to be compared with a reference signature generated at link-

　　time and stored at a given memory location