Homework Answers
immediate pre-indexed mode is used in LDRH where this instruction is load in regster half word of 16 bits. This means that ! will reflect back the address in base register.
LDRH R1, [R0,#2]!
R1 = [R0 + 2] = 0x0304
R0 is updated with +2 = 0x2000.0002
LDRH R2, [R0,#2]!
R2 = [R0+2] = 0x0506
R0 is updated with +2 = 0x2000.0004
ADD R3,R1,R2
R3 = 0x0304 + 0x0506
hex addition
R3 = 0x080A
STR R3, [R0]
is a 32 bit instruction so it will store value from R3 to 4 bytes address of R0
0x2000.0004 will point to 0x0A
0x2000.0005 will point to 0x08
0x2000.0006 will point to 0x00
0x2000.0007 will point to 0x00
1)After execution the values are
| Register | Value |
| R0 | 0x2000.0004 |
| R1 | 0x0304 |
| R2 | 0x0506 |
| R3 | 0x080A |
2)Content of memory
| Address | Value |
| 0x2000.0000 | 0x01 |
| 0x2000.0001 | 0x02 |
| 0x2000.0002 | 0x03 |
| 0x2000.0003 | 0x04 |
|
0x2000.0004 |
0x0A |
| 0x2000.0005 | 0x08 |
| 0x2000.0006 | 0x00 |
| 0x2000.0007 | 0x00 |
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