STM32W108C8U63TR STMicroelectronics, STM32W108C8U63TR Datasheet - Page 28
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STM32W108C8U63TR
Manufacturer Part Number
STM32W108C8U63TR
Description
16/32-BITS MICROS
Manufacturer
STMicroelectronics
Series
STM32r
Datasheet
1.STM32W108C8U63TR.pdf
(207 pages)
Specifications of STM32W108C8U63TR
Applications
RF4CE, Remote Control
Core Processor
ARM® Cortex-M3™
Program Memory Type
FLASH (64 kB)
Controller Series
STM32W
Ram Size
8K x 8
Interface
I²C, SPI, UART/USART
Number Of I /o
24
Voltage - Supply
1.18 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-VFQFN Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Embedded memory
4.2.2
4.3
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6.
RAM memory protection
The STM32W108C8 integrates two memory protection mechanisms. The first memory
protection mechanism is through the ARM® Cortex-M3 Memory Protection Unit (MPU)
described in the Memory Protection Unit section. The MPU may be used to protect any area
of memory. MPU configuration is normally handled by software. The second memory
protection mechanism is through a fine granularity RAM protection module. This allows
segmentation of the RAM into 32-byte blocks where any block can be marked as write
protected. An attempt to write to a protected RAM block using a user mode write results in a
bus error being signaled on the AHB System bus. A system mode write is allowed at any
time and reads are allowed in either mode. The main purpose of this fine granularity RAM
protection module is to notify the stack of erroneous writes to system areas of memory. RAM
protection is configured using a group of registers that provide a bit map. Each bit in the map
represents a 32-byte block of RAM. When the bit is set the block is write protected.
The fine granularity RAM memory protection mechanism is also available to the peripheral
DMA controllers. A register bit is provided to enable the memory protection to include DMA
writes to protected memory. If a DMA write is made to a protected location in RAM, a
management interrupt is generated. At the same time the faulting address and the
identification of the peripheral is captured for later debugging. Note that only peripherals
capable of writing data to RAM, such as received packet data or a received serial port
character, can generate this interrupt.
Memory protection unit
The STM32W108C8 includes the ARM® Cortex-M3 Memory Protection Unit, or MPU. The
MPU controls access rights and characteristics of up to eight address regions, each of
which may be divided into eight equal sub-regions. Refer to the ARM® Cortex-M3 Technical
Reference Manual (DDI 0337A) for a detailed description of the MPU.
ST software configures the MPU in a standard configuration and application software should
not modify it. The configuration is designed for optimal detection of illegal instruction or data
accesses. If an illegal access is attempted, the MPU captures information about the access
type, the address being accessed, and the location of the offending software. This simplifies
software debugging and increases the reliability of deployed devices. As a consequence of
this MPU configuration, accessing RAM and register bit-band address alias regions is not
permitted, and generates a bus fault if attempted.
Serial Controller 1 Transmit
Doc ID 018587 Rev 1
STM32W108C8
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