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Bit banding cortex-m3 technical reference manual

About this book This book contains documentation for the CortexM3 processor, describing the programmers model, instructions, registers, memory map, cache and debug support. Components include ETM, MPU, NVIC, This book is for the CortexM3 processor.

Product revision status The r n p n identifier indicates the revisi on status of the product described in this manual, where: ARM DDI 0337G Unrestricted Access The CortexM3 processor is built on a highperformance processor core, with a 3stage pipeline Harvard architecture, making it ideal for demanding embedded applications.

The Bitbanding is an optional feature of the CortexM3 processor. Bitbanding maps a complete word of memory onto a single bit in the bitband region. For example, writing to one of the alias words sets or clears the corresponding bit in the bitband region.

The bitbanding allows you to not care about the bits nearby and just address the bit like it was the full word.

You may tend to want to sent a single IO on and off. You cannot put everything as bitbanding as it is using the address space: for each bit, you use the original bit location and a word for the bitbanding region According to the images from ARM CortexM3 Technical Reference Manual you can see that there is a 1MBlong area in peripheral are starting from 0x and ends 0x, so 0x is out of this range and accessed normally (not bit by bit).

Jan 02, 2010 ii Copyright 2005, 2006 ARM Limited. All rights reserved. ARM DDI 0337E CortexM3 Technical Reference Manual Copyright 2005, 2006 ARM Limited. All rights Bitbanding Bitbanding maps a complete word of memory onto a single bit in the bitband region. For example, writing to one of the alias words sets or clears the corresponding bit in the bitband region. This enables every individual bit in the bitbanding region to be directly accessible from a View and Download ARM CortexM3 technical reference manual online.

r2p0. CortexM3 Processor pdf manual download. Bitwordoffset is the position of the target bit in the bitband memory region. Bitwordaddr is the address of the word in the alias memory region that maps to the targeted bit. Bitbandbase is the starting address of the alias region. ii Copyright 2005, 2006 ARM Limited. All rights reserved. ARM DDI 0337B CortexM3 Technical Reference Manual Copyright 2005, 2006 ARM Limited. View and Download ARM CortexM3 technical reference manual online. CortexM3 Computer Hardware pdf manual download.