Texas Instruments MSP430x1xx - Manual (Page 55)

Data in the Memory
4-3
Memory
4.2 Data in the Memory
Bytes are located at even or odd addresses as shown in Figure 4–3. However,
words are only located at even addresses. Therefore, when using word
instructions, only even addresses may be used. The low byte of a word is
always at an even address. The high byte of a word is at the next odd address
after the address of the word. For example, if a data word is located at address
xxx2h, then the low byte of that data word is located at address xxx2h, and the
high byte of that word is located at address xxx3h.
Figure 4–3. Bits, Bytes, and Words in a Byte - Organized Memory
15
7
14
6
. . Bits . .
. . Bits . .
9
1
8
0
Byte
Byte
Word (High Byte)
Word (Low Byte)
xxxAh
xxx9h
xxx8h
xxx7h
xxx6h
xxx5h
xxx4h
xxx3h