Hardware support for floating point operations the

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Hardware support for floating-point operations The Vector Floating-Point(VFP) is the hardware that provides support for ARM memory to execute float point operation. This is a co-processor extension that support single and double precision floating point calculation. Memory Models Memory Spaces ARM microprocessors see a single memory space of variable size depending on the particular chip. This may be divided into a number of different sections. For example, the Cortex_M3 has 8 sections in memory for code, SRAM, peripherals and so on. Data and code are in the same memory space. All register are mapped into a same 32-bit memory space which is similar to the architecture of AVR. Address Spaces The ARM microprocessor has 32-bit address space which the maximum memory space is 232 (4G). Memory is arranged in a linear array with 232 byte locations (32-bit addresses and 32-bit processor registers). Registers The ARM microprocessor has 37 general registers. ARM has two types of
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registers: general-purpose resister and program status register, however no I/O registers (AVR has I/O registers). Each exception handler has its own status register. There are 31 general-purpose registers and they are 32-bits wide (AVR general-purpose register only has 8-bits wide) and visible to user. The number of program status registers is 6 which are used to keep the program status and also 32-bits wide (8-bits in AVR). The 6 status registers are 1 CPSR (Current Program Status Register) which stores status of current execution and 5 SPSR (Saved Program Status Register) which are used to copy the value of CPSR register respectively. Comparing Interrupt Systems AVR ARM No fast interrupts Fast interrupts mask normal interrupts Maskable interrupts can be disabled by setting ‘I’ in Status Register Normal and fast interrupts can be
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