0xE0000000

0xE0000000 is a 32-bit hexadecimal constant. As an unsigned 32-bit value, it equals 3,758,096,384, and when interpreted as a signed 32-bit integer it equals -536,870,912. In binary, the value is 1110 0000 0000 0000 0000 0000 0000 0000. The leading nibble E (1110) places the value in the upper portion of the 32-bit address space and is commonly viewed in contexts where memory addresses or bit masks are discussed.

In the context of ARM Cortex-M microcontrollers, 0xE0000000 is notable as the base address of the Private Peripheral Bus (PPB). The PPB is a memory-mapped region that provides access to system-level and debug peripherals. The PPB range generally spans from 0xE0000000 to 0xE000FFFF, with specific peripherals mapped at offsets within that region. Within this area are registers related to debugging and system control, such as the CoreSight components and the System Control Space, although the exact peripheral layout can vary by microcontroller model.

Endianness is a consideration when storing or transmitting the 0xE0000000 value in memory. In little-endian systems, the four bytes appear in memory as 00 00 00 E0, while in big-endian systems they would be stored as E0 00 00 00.

In programming, 0xE0000000 is primarily encountered as a concrete address or a bit-pattern constant in low-level code, embedded software, or debugging contexts. Its interpretation depends on the surrounding architecture (for example, memory maps in ARM Cortex-M devices) and should be used with awareness of the target system’s addressing scheme.