Fujitsu MB90460 Series, Hardware Manual, Page: 57 / 739

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CHAPTER 3 CPU
■
Storage of Multi-byte Data in a Stack
Figure 3.5-3 shows the configuration of multi-byte data in a stack.
Figure 3.5-3 Storage of Multi-byte Data in a Stack
■
Multi-byte Data Access
Accessing is generally performed within a bank. For an instruction that accesses multi-byte data, the
address following "FFFF
H
" is "0000
H
" in the same bank. Figure 3.5-4 shows an example of executing an
instruction that accesses multi-byte data on a bank boundary.
Figure 3.5-4 Multi-byte Data Access on a Bank Boundary
6D
H
F0
H
35
H
A4
H
H
L
Address ‘n’
(35A4
H
) (6DF0
H
)
PUSH RW1,RW3
PUSHW RW1
,
RW3
RW1: 35A4
H
RW3: 6DF0
H
* : Stack status after execution of the PUSHW instruction
SP
AL before execution
AL after execution
01
H
23
H
H
L
800000
H
?? ??
23
H
01
H
80FFFF
H
……..