Chapter5 PseudoOps

Chapter5 PseudoOps - Chapter 5 Memory Organization and...

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Software and Hardware Engineering: Motorola M68HC12 Copyright © 2000 by Oxford University Press, Inc. Chapter 5 Memory Organization and Assembler “Pseudoinstructions” for setting up data and constants in memory
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Software and Hardware Engineering: Motorola M68HC12 Copyright © 2000 by Oxford University Press, Inc. HCS12 memory $0000 $0001 $0002 $0003 $0004 $FFFD $FFFE $FFFF …. Memory “address” = 16 bits $ denotes hexadecimal Therefore, memory address space = 2 16 (64K = 65,536) bytes Comparable to an array of characters in C: char memory[65536]; 7 0 7 6 5 4 3 2 1 0 8 bits per byte Bit numbers
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Software and Hardware Engineering: Motorola M68HC12 Copyright © 2000 by Oxford University Press, Inc. MC9S12C32 memory map (Fig. 4.3) On-chip memory addresses are “fixed”
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Software and Hardware Engineering: Motorola M68HC12 Copyright © 2000 by Oxford University Press, Inc. Designating available memory areas for MCS9C32 (in Code Warrior ) RAMStart EQU $0800 ; absolute address to place variables
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Chapter5 PseudoOps - Chapter 5 Memory Organization and...

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