HD64F2149YV datasheet(128/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Section 4 Exception Handling

Rev. 3.00 Jan 18, 2006 page 100 of 1044

REJ09B0280-0300

4.6

Notes on Use of the Stack

When accessing word data or longword data, the chip assumes that the lowest address bit is 0. The

stack should always be accessed by word transfer instruction or 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 Rn

(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)

Setting SP to an odd value may lead to a malfunction. Figure 4.6 shows an example of what

happens when the SP value is odd.

Legend:

CCR: Condition-code register

PC:

Program counter

R1L: General register R1L

SP:

Stack pointer

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

mode.

CCR

R1L

H'FFFEFA

H'FFFEFB

H'FFFEFC

H'FFFEFD

H'FFFEFF

MOV.B R1L, @–ER7

SP set to H'FFFEFF

TRAP instruction executed

Data saved above SP

Contents of CCR lost

Figure 4.6 Operation when SP Value is Odd

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