STY
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| Store Y Index In Memory | ||||||
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STY (Store Y Index In Memory) stores the Y index into a specified memory address. It is similar in function to STA and STY.
Operation
This pseudo C code shows how the STY opcode functions when it is executed.
STORE(Operand, Y); // Stores the Y Index Register into the memory address specified in the operand.
Addressing Modes
| Addressing Mode | Assembly Language Form | Opcode | # Bytes | # Cycles |
|---|---|---|---|---|
| Zero Page | STY Operand | 84 | 2 | 3 |
| Zero Page, X | STY Operand, X | 94 | 2 | 4 |
| Absolute | STY Operand | 8C | 3 | 4 |