Fujitsu F2MC-16LX Hardware Manual page 50

CHAPTER 2 CPU
The accumulator (A) is not initialized by a reset. Immediately after a reset, its value becomes
undefined (see Figure 2.4-5).
MOV A,3000H
A before execution
A after execution
MOVX A,3000H
A before execution
A after execution
34
Figure 2.4-4 Example of Zero Extension
(This instruction expands the contents at address 3000
and stores the result in the AL.)
XXXX 2456
H H
DTB B5
H
2456 0088
H H
AH AL
Figure 2.4-5 Example of Sign Extension
(This instruction expands the data at address 3000H with signs,
and stores the result in the AL.)
XXXX 2456
H H
DTB B5
H
2456 FF88
H H
AH AL
by adding zeros,
H
MSB Memory space
B53000 77
H H
MSB Memory space
B53000 77
H H
LSB
88
H
LSB
88
H