1. Addressing Modes Immediate #<data> or Imm
data is part of the instruction
Register Direct Dn or An
data is in a register
the register number is part of the instruction
Memory Direct (xxx).W or (xxx).L
data is in a memory location
the address of the memory location is part of the instruction

2. Addressing Modes Address Register Indirect (An)
operand is written as (An)
the address of the data is in the address register
<ea> = (An)
instruction
registers
memory

3. Indirect Addressing … initializing An
to load an address into an address register 1. 2.
the following will not work:
MOVEA.L NUM,A1
MOVE.L NUM,(A1)
Assume: A1 contains $3000, and ORG $600 NUM DC.L 2005

4. e. g. Write a program to count the number of 6’s in a list
e.g. Write a program to count the number of 6’s in a list. The number of items in the list is provided.
input: list_len = 20
list = 1,6,4,5,5,6,2,5,6,7,6,6,6,1,3,5,9,6,7,5
output:
algorithm:

5. e. g. Sum the numbers in an array given the length of the array
e.g. Sum the numbers in an array given the length of the array. [To be added later: check if there is data and if sum is in range.]
input: array
array_l
output: sum
algorithm:

6. Expectations:
you can use both the LEA and MOVEA techniques to correctly initialize an address register for use with indirect addressing
later, you can do the above initialization to traverse the list/array in either direction
you can use indirect addressing correctly
you can do operations on the data in a list, e.g. find min/max, count, arithmetic operations