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ECED 3204. Microprocessors
M68HC11 Microcontroller
Instruction INC 2,X
Step 5. Executing the increment operation:
Result = $39 + 1 = $3A
Memory contents
Address bus
$D402
CPU
$3A
Data bus
Address
$??
$??
$??
$??
$3A
$??
$??
$??
$??
$D3FE
$D3FF
$D400
$D401
$D402
$D403
$D404
$D405
$D406
Step 6. Storing the result back to the memory address
Instruction 4 -- Increment & write cycles
Dalhousie University
104
Jose A. Gonzalez-Cueto