micro-controller motorola hcs12 addressing modes mechatronics department faculty of engineering ain...
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MICRO-CONTROLLER MOTOROLA HCS12Addressing Modes
Mechatronics
Department
Faculty of EngineeringAin Shams Univeristy
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HCS12 Addressing Modes
HCS12 instruction set can be categorized according to the type of operand used for every instruction.
Immediate Addressing. Direct/Extended Addressing. Indexed Addressing. Inherent Addressing. Relative Addressing.
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HCS12 Programmer’s model Accumulator (Operand Register). Index Registers X&Y (Keeps
addresses for specific instructions using addresses as operands).
Stack Pointer (Keeps track of program stack in the Ram).
Program Counter (Keeps track of the program script).
A B
X
Y
SP
PC
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$ 5000
$ 5001 Op-Code
$ 5002 Operand
$ 5003
$ 5004
$ 5005
Instruction Set Example
ldaa#$64; ldaa#$6464; Operand
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Immediate Addressing ldaa#$64;
# = Immediate
A B
X
Y
SP
PC
#$64
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Direct Addressing ldaa$64;
No sign= Direct Addressing
A B
X
Y
SP
PC
$ 0063 ……
$ 0064 $FF
$ 0065 ……
$64
$FF
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Extended Addressing ldd $1234;
2 bytes operand= Extended Addressing
D
X
Y
SP
PC
$ 1233 ……
$ 1234 $FF
$ 1235 $FF
$1234
$FF$FF
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Indexed Addressing ldaa!1,x;
Use index register X, Y, SP or PC
A B
X $0064
Y
SP
PC
$ 0064 ……
$ 0065 $FF
$ 0066 ……
$0064
$FF
+1
$0065
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Indexed Pre-decrement Addressing
ldaa!1,-x;
Use sign before index register X, Y, SP or PC
A B
X $0065
Y
SP
PC
$ 0064 $FF
$ 0065 ……
$ 0066 ……
$0064
$FF
-1
$0065$0064
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Indexed Post-increment Addressing
ldaa!1,x+;
Use sign after index register X, Y, SP or PC
A B
X $0064
Y
SP
PC
$ 0064 $FF
$ 0065 ……
$ 0066 ……
$0064
$FF
+1
$0065$0064
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Indexed Indirect Addressing ldaa[!1,x];
Use [ ] with index register X, Y, SP or PC
A B
X $0064
Y
SP
PC
$ 0064 ……
$ 0065 $00
$ 0066 $67
$ 0067 $FF
$0064
$FF
+1
$0065 $006
7$0067
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Eng. Mohamed Mahmoud Hamdy
Eng. Mostafa Ahmed Arafa
Prepared by: