PM0044 |
STM8 instruction set |
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7.2Nomenclature
7.2.1Operators
←is loaded with ...
↔ has its value exchanged with ...
7.2.2CPU registers
A |
accumulator |
X |
X index register (2 bytes) |
XL |
least significant byte of the X index register (1 byte) |
XH |
most significant byte of the X index register (1 byte) |
Y |
Y index register (2 bytes) |
YL |
least significant byte of the Y index register (1 byte) |
YH |
most significant byte of the Y index register (1 byte) |
PC |
program counter register (3 bytes) |
PCL |
low significant byte of the program counter register (1 byte) |
PCH |
high significant byte of the program counter register (1 byte) |
PCE |
extended significant byte of the program counter register (1 byte) |
SP |
stack pointer register (2 bytes) |
CC |
Condition code register (1 byte) |
CC.V |
overflow flag of the code condition register (1 bit) |
CC.I0 |
interrupt mask bit 0 of the code condition register (1 bit) |
CC.H |
half carry flag of the code condition register (1 bit) |
CC.I1 |
interrupt mask bit 1 of the code condition register (1 bit) |
CC.N |
negative flag of the code condition register (1 bit) |
CC.Z |
zero flag of the code condition register (1 bit) |
CC.C carry flag of the code condition register (1 bit)
7.2.3Code condition bit value notation
-bit not affected by the instruction
1 |
bit forced to 1 by the instruction |
0 |
bit forced to 0 by the instruction |
X bit modified by the instruction
7.2.4Memory and addressing
M(...) |
content of a memory location |
R |
8-bit operation result value |
R(...) |
8-bit operation result value stored into the register or memory shown inside parentheses |
Rn |
bit n of the operation result value (0≤n≤7) |
XX.B |
bit B of the XX register or memory location |
imm.b |
byte immediate value |
imm.w |
16-bit immediate value |
shortmem |
memory location with short addressing mode (1 byte) |
longmem |
memory location with long addressing mode (2 bytes) |
extmem |
memory location with extended addressing mode (3 bytes) |
shortoff |
short offset (1 byte) |
longoff |
long offset (2 bytes) |
extoff |
extended offset (3 bytes) |
[shortptr.w] short pointer (1 byte) on long memory location (2 bytes). Assembler notation = [$12.w]. |
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[longptr.w] |
long pointer (2 bytes) on long memory location (2 bytes). Assembler notation = [$1234.w] |
[longptr.e] |
long pointer (2 bytes) on extended memory location (3 bytes). Assembler notation = [$1234.e] |
Doc ID 13590 Rev 3 |
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