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LPC1700 Microcontroller Slide 9
To overcome this restriction, a technique called bit banding allows direct bit manipulation on sections of the peripheral and SRAM memory spaces, without the need for any special instructions. The bit addressable regions of the Cortex-M3 memory map are composed of: the bit-band region (which is up to 1MB of real memory or peripheral registers) and the bit-band alias region, which takes up to 32MB of the memory map. Bit-banding works by mapping each bit in the bit-band region to a word address in the Alias region. So by setting and clearing the aliased word, address bits can be set and cleared in the real memory. This image shows a bit-banding example for the SRAM region.
PTM Published on: 2011-11-02