H8SLASH3028F datasheet(109/923 Pages) RENESAS

Nome de Peças	H8/3028F

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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109 / 923 page

Rev. 2.00, 09/03, page 79 of 890

4.6

Notes on Stack Usage

When accessing word data or longword data, the H8/3028 Group regards the lowest address bit as

0. The stack should always be accessed by word access or longword access, and the value of the

stack pointer (SP, ER7) should always be kept even.

Use the following instructions to save registers:

PUSH.W Rn

(or MOV.W Rn, @–SP)

PUSH.L ERn

(or MOV.L ERn, @–SP)

Use the following instructions to restore registers:

POP.W Rn

(or MOV.W @SP+, Rn)

POP.L ERn

(or MOV.L @SP+, ERn)

Setting SP to an odd value may lead to a malfunction. Figure 4.7 shows an example of what

happens when the SP value is odd.

TRAPA instruction executed

CCR

Legend

CCR:

PC:

R1L:

SP:

R1L

MOV. B R1L, @-ER7

SP set to H'FFFEFF

Data saved above SP

CCR contents lost

Condition code register

Program counter

General register R1L

Stack pointer

Note: The diagram illustrates modes 3 and 4.

H'FFFEFA

H'FFFEFB

H'FFFEFC

H'FFFEFD

H'FFFEFF

Figure 4.7 Operation when SP Value is Odd

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