H8SX1663 datasheet(143/1158 Pages) RENESAS

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Section 4 Exception Handling

Rev.1.00 Jun. 07, 2006 Page 91 of 1102

REJ09B0294-0100

4.9

Usage Note

When performing stack-manipulating access, this LSI assumes that the lowest address bit is 0. The

stack should always be accessed by a word transfer instruction or a longword transfer instruction,

and the value of the stack pointer (SP: ER7) should always be kept even. Use the following

instructions to save registers:

PUSH.W

(or MOV.W Rn, @-SP)

PUSH.L

ERn

(or MOV.L ERn, @-SP)

Use the following instructions to restore registers:

POP.W

(or MOV.W @SP+, Rn)

POP.L

ERn

(or MOV.L @SP+, ERn)

Performing stack manipulation while SP is set to an odd value leads to an address error. Figure 4.4

shows an example of operation when the SP value is odd.

CCR :

PC :

R1L :

SP :

Condition code register

Program counter

General register R1L

Stack pointer

CCR

R1L

H'FFFEFA

H'FFFEFB

H'FFFEFC

H'FFFEFD

H'FFFEFE

H'FFFEFF

TRAPA instruction executed

SP set to H'FFFEFF

Data saved above SP

MOV.B R1L, @-ER7 executed

Contents of CCR lost

Address

[Legend]

Note: This diagram illustrates an example in which the interrupt control mode is 0, in advanced mode.

(Address error occurred)

Figure 4.4 Operation when SP Value is Odd

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