PM0044 STM8 instruction set
POPW |
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Pop word from stack |
POPW |
Syntax |
POPW dst |
e.g. POPW X |
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Operation |
dstH <= (++SP) |
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dstL <= (++SP) |
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Description Restore from the stack a data value which will be placed in dst location (index register). The stack pointer is incremented by two. This instruction is used to restore an index register value.
Instruction overview
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dst |
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Affected condition flags |
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I1 |
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I0 |
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POPW |
X |
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POPW |
Y |
- |
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Detailed description
dst |
Asm |
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X |
POPW X |
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Y |
POPW Y |
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See also: PUSHW, POP
cy |
lgth |
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2 |
1 |
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2 |
2 |
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Op-code(s) |
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ST7 |
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85 |
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85 |
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Doc ID 13590 Rev 3 |
127/162 |
STM8 instruction set |
PM0044 |
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PUSH |
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Push into the Stack |
PUSH |
Syntax |
PUSH src |
e.g.:PUSH A |
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Operation |
(SP--) <= dst |
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Description |
Save into the stack the dst byte location. The stack pointer is decremented |
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by one. Used to save a register value and a memory byte on to the stack. |
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Instruction overview
mnem |
dst |
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Affected condition flags |
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I0 |
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PUSH |
A |
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PUSH |
CC |
- |
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PUSH |
Imm |
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PUSH |
Mem |
- |
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Detailed description
dst |
Asm |
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cy |
lgth |
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Op-code(s) |
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ST7 |
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A |
PUSH A |
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1 |
1 |
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88 |
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CC |
PUSH CC |
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1 |
1 |
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8A |
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#byte |
PUSH #$10 |
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1 |
2 |
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4B |
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XX |
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longmem |
PUSH $1000 |
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3 |
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3B |
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MS |
LS |
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See also: POP, PUSHW
128/162 |
Doc ID 13590 Rev 3 |
PM0044 STM8 instruction set
PUSHW |
Push word onto the Stack |
PUSHW |
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Syntax |
PUSHW src |
e.g. PUSHW X |
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Operation |
(SP--) <= dstL |
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(SP--) <= dstH |
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Description Save the dst index register onto the stack. The stack pointer is decremented by two. Used to save an index register value onto the stack.
Instruction overview
mnem |
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dst |
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Affected condition flags |
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V |
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I1 |
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H |
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I0 |
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C |
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PUSHW |
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X |
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PUSHW |
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Y |
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Detailed description |
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dst |
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Asm |
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cy |
lgth |
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Op-code(s) |
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ST7 |
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X |
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PUSHW X |
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2 |
1 |
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89 |
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Y |
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PUSHW Y |
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2 |
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See also: POPW, PUSH
Doc ID 13590 Rev 3 |
129/162 |
STM8 instruction set |
PM0044 |
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RCF |
Reset Carry Flag |
RCF |
Syntax |
RCF |
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Operation |
C = 0 |
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Description |
Clear the carry flag of the Condition Code (CC) register. May be used as a |
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boolean user controlled flags. |
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Instruction overview
mnem |
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Affected condition flags |
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V |
I1 |
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I0 |
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C |
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RCF |
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0 |
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C: 0
Cleared.
Detailed description
Addressing |
Asm |
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cy |
lgth |
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Op-code(s) |
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ST7 |
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mode |
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Inherent |
RCF |
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1 |
1 |
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98 |
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See also: SCF, RVF
130/162 |
Doc ID 13590 Rev 3 |
PM0044 |
STM8 instruction set |
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RET |
Return from subroutine |
Syntax |
RET |
Operation |
MSB (PC) = (++SP) |
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LSB (PC) = (++SP) |
RET
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Description |
Restore the PC from the stack. The stack pointer is incremented twice. This |
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instruction, is the last instruction of a subroutine in same section. |
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Instruction overview |
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mnem |
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Affected condition flags |
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V |
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I1 |
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I0 |
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C |
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RET |
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Detailed description |
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Addressing |
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Asm |
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cy |
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lgth |
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Op-code(s) |
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ST7 |
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mode |
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Inherent |
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RET |
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4 |
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1 |
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See also: CALL, CALLR |
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Note: |
Please note that the RET should be in the same section as the corresponding CALL. |
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Doc ID 13590 Rev 3 |
131/162 |