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Module 3
68HC11 Addressing Modes

68HC11 Addressing Modes o Aims
To review 68HC11 data transfer instructions and applying the controller addressing modes

o Learning Outcomes
At the end of this module, students should be able to understand • Inherent Addressing Mode
• Immediate Addressing Mode
• Direct Addressing Mode
• Extended Addressing Mode
• Indexed Addressing Mode
• Relative Addressing Mode
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2/Module 3

Addressing Modes

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Addressing Modes o The CPU can access data in various ways. The data ways. could be in a register, or in memory, or provided as value. an immediate value. These various ways of accessing data are called addressing modes

o The various addressing modes of a microprocessor are determined when it is designed, and therefore cannot be changed by the programmer
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Inherent Addressing Mode o In this addressing mode all the information required for execution is contained in the instruction o No other operand is required o Examples:
•
•
•
•
•

CLRA
ABA
INCB
INX
TAB

; Clear register A; ACCA ← $00
; ACCA ← ACCA + ACCB
; ACCB ← ACCB + 1
; IX ← IX + 1
; ACCB ← ACCA
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Immediate Addressing Mode o In immediate addressing the instruction itself contains the data to be loaded into the destination o Examples:
•
•
•
•
•

LDAA
ADDA
LDD
LDAB
LDX

#15
#$15
#1000
#’C’
#$1234

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Direct Addressing Mode o In direct addressing the least significant byte of the 16-bit address of the operand is in the instruction o The high order byte is taken to be $00. This is how you access the
256 bytes of RAM. (could also use extended)

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Extended Addressing Mode o In extended addressing the address of the data is a part of the instruction o The address is 16-bit size, thus can access any locations

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8/Module 3

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