http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Thu, 20 Nov 2008 19:31:38 -0800 http://backend.userland.com/rss092 please do not post on this thread for doubts post on http://www.8051projects.net/forum-t5636-last.html chapter 1 ARM ArchitectureThis chapter outl <noauthor@nospam.com> http://www.8051projects.net/forum-t5633.html 1.1 Processor modesThe ARM supports the seven processor modes shown in table1.1.Mode changes can be made under software control, or can be caused by e shyam<shyam@nospam.com> http://www.8051projects.net/forum-t5633.html table1.1 shyam<shyam@nospam.com> http://www.8051projects.net/forum-t5633.html The modes other than User mode are known as privileged modes. They have full access to systemresources and can change mode freely. Five of them are kn shyam<shyam@nospam.com> http://www.8051projects.net/forum-t5633.html 1.2 RegistersThe ARM has a total of 37 registers. These comprise 30 general purpose registers, 6 status registersand a program counter. Figure 1.2 ill shyam<shyam@nospam.com> http://www.8051projects.net/forum-t5633.html fig1.2 shyam<shyam@nospam.com> http://www.8051projects.net/forum-t5633.html 1.2.1 The stack pointer, SP or R13Register R13 is used as a stack pointer and is also known as the SP register. Each exception modehas its own version shyam<shyam@nospam.com> http://www.8051projects.net/forum-t5633.html