By G. Jack Lipovski
The "M?·CORE" relations of microprocessors is the newest 32-bit built-in circuit from Motorola designed to be a multi-purpose "micro-controller." The processor structure has been designed for prime functionality and cost-sensitive embedded regulate purposes with specific emphasis on decreased energy intake. this is often the 1st ebook at the programming of the hot language guide set utilizing the M?·CORE chip.Embedded Microcontroller Interfacing for M?·CORE structures is the 3rd of a trio of books by way of G. Jack Lipovski from the college of Texas. the 1st books are on meeting language programming for the recent Motorola 6812 16-bit microcontroller, and have been written to be textbooks references. This ebook used to be written on the request of the Motorola layout crew for the pro clients of its new and intensely profitable M?·CORE chip microcontrollers. Written with the full cooperation and enter of the M?·CORE layout engineers at their headquarters in Austin, Texas, this e-book covers all points of the programming software program and of the M?·CORE chip. * First introductory point ebook at the Motorola MoCORE* Teaches engineers how a working laptop or computer executes directions* indicates how a high-level programming language converts to assembler language* Teaches the reader how a microcontroller is interfaced to the surface international* enormous quantities of examples are used through the textual content* Over two hundred homework difficulties supply the reader in-depth perform* A CD-ROM with HIWARE's C++ compiler is integrated with the ebook* a whole precis bankruptcy on different on hand microcontrollers
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20. Repeat problem 19 where the numbers are 32-bit signed. 21. Repeat problem 20 where the numbers are 16-bit unsigned numbers. 22. Repeat problem 20 where the numbers are 16-bit signed numbers. 23. Write a shortest assembly-language program that adds a 5-byte unsigned number stored in consecutive locations, the first of which is at location 0x803, to a 5-byte unsigned number stored in consecutive locations, the first of which is at location 0x813. If any unsigned number addition errors occur, branch to ERROR.
The M C O R E edit instruction a s r r 3 , r7 shifts r 3 right arithmetically (filling with sign bits) a number of bits specified by rV. The C bit is not affected. The instruction a s r c r3 shifts r 3 right arithmetically one bit, putting the bit shifted out into C a s r i r 3 , 31 shifts r 3 right arithmetically 31 bits. Similar instructions I s r , I s r c , and I s r i shift right logically (filling with zeros) and I s l , I s l e , and I s l i shift left, in similar manner. The instruction r o t l i r3,31 is a circular left shift of register r 3 by 31 bit positions.
According to Motorola's Application Binary Interface Standard, the first seven local variables should be stored in GPR r 8 to r l 4 . These can be saved when the return address is saved, and restored when the return address is restored. For instance, if the subroutine has two 32-bit local variables in r l 3 and in r l 4 , then they are saved by: subi r0,12 stm r l 3 - r l 5 , ( r O ) and they are restored using: Idmrl3-rl5, (rO) addi r0,12 jmp rl5 The stack fills out, starting at high addresses and building toward lower addresses, in the stack buffer.
Embedded Microcontroller Interfacing for M-CORE Systems by G. Jack Lipovski