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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.
RW1: 35A4
RW3: 6DF0
*: Stack status after execution of the PUSHW instruction
■ Multi-byte Data Access
Accessing is generally performed within a bank. For an instruction that accesses multi-byte data, the
address following "FFFF
instruction that accesses multi-byte data on a bank boundary.
H
80FFFF
H
800000
H
L
38
Figure 3.5-3 Storage of Multi-byte Data in a Stack
PUSH RW1,RW3
H
SP
6D
H
F0
H
35
Address 'n'
H
A4
H
L
H
H
" is "0000
H
Figure 3.5-4 Multi-byte Data Access on a Bank Boundary
01
H
23
H
PUSHW RW1
" in the same bank. Figure 3.5-4 shows an example of executing an
H
AL before execution
AL after execution
RW3
,
(35A4
) (6DF0
)
H
H
??
??
23
01
H
H
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