Rev. 3.0, 10/02, page 73 of 686
4.8
Notes on Use of the Stack
When accessing word data or longword data, this LSI 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 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 4.4 shows an example of what
happens when the SP value is odd.
SP
CCR :
PC :
R1L :
SP :
Condition code register
Program counter
General register R1L
Stack pointer
CCR
SP
SP
R1L
H'FFFEFA
H'FFFEFB
H'FFFEFC
H'FFFEFD
H'FFFEFE
H'FFFEFF
PC
PC
TRAP 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.
Figure 4.4 Operation when SP Value is Odd
Содержание H8S/2215 Series
Страница 4: ...Rev 3 0 10 02 page iv of lviii ...
Страница 6: ...Rev 3 0 10 02 page vi of lviii ...
Страница 28: ...Rev 3 0 10 02 page xxviii of lviii ...
Страница 122: ...Rev 3 0 10 02 page 64 of 686 ...
Страница 132: ...Rev 3 0 10 02 page 74 of 686 ...
Страница 156: ...Rev 3 0 10 02 page 98 of 686 ...
Страница 198: ...Rev 3 0 10 02 page 140 of 686 ...
Страница 320: ...Rev 3 0 10 02 page 262 of 686 ...
Страница 384: ...Rev 3 0 10 02 page 326 of 686 ...
Страница 474: ...Rev 3 0 10 02 page 416 of 686 ...
Страница 481: ...Rev 3 0 10 02 page 423 of 686 I O pin Control OUT IN TDI pin TDO pin Figure 14 2 Boundary Scan Register Configuration ...
Страница 608: ...Rev 3 0 10 02 page 550 of 686 ...
Страница 614: ...Rev 3 0 10 02 page 556 of 686 ...
Страница 650: ...Rev 3 0 10 02 page 592 of 686 ...
Страница 652: ...Rev 3 0 10 02 page 594 of 686 ...
Страница 680: ...Rev 3 0 10 02 page 622 of 686 ...
Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
Страница 732: ...Rev 3 0 10 02 page 674 of 686 ...
Страница 740: ...Rev 3 0 10 02 page 682 of 686 ...