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Starting the SBC instruction

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Anonymus Raccoon
2020-02-25 23:32:19 +01:00
parent 4da96894ae
commit a421ef693f
2 changed files with 7 additions and 1 deletions
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sources/CPU/CPU.hpp
+2 -1
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@@ -393,7 +393,6 @@ namespace ComSquare::CPU
//! @brief Return from Interrupt - Used to return from a interrupt handler. //! @brief Return from Interrupt - Used to return from a interrupt handler.
void RTI(); void RTI();
//! @brief Add with carry - Adds operand to the Accumulator; adds an additional 1 if carry is set. //! @brief Add with carry - Adds operand to the Accumulator; adds an additional 1 if carry is set.
//! @return The number of extra cycles that this operation took.
void ADC(uint24_t valueAddr); void ADC(uint24_t valueAddr);
//! @brief Store the accumulator to memory. //! @brief Store the accumulator to memory.
void STA(uint24_t addr); void STA(uint24_t addr);
@@ -461,6 +460,8 @@ namespace ComSquare::CPU
void XCE(); void XCE();
//! @brief And accumulator with memory. //! @brief And accumulator with memory.
void AND(uint24_t valueAddr); void AND(uint24_t valueAddr);
//! @brief Subtract with Borrow from Accumulator.
void SBC(uint24_t valueAddr);
public: public:
explicit CPU(std::shared_ptr<Memory::MemoryBus> bus, Cartridge::Header &cartridgeHeader); explicit CPU(std::shared_ptr<Memory::MemoryBus> bus, Cartridge::Header &cartridgeHeader);
CPU(const CPU &) = default; CPU(const CPU &) = default;
sources/CPU/Instructions/MathematicalOperations.cpp
+5
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@@ -26,4 +26,9 @@ namespace ComSquare::CPU
this->_registers.p.z = this->_registers.a == 0; this->_registers.p.z = this->_registers.a == 0;
this->_registers.p.n = this->_registers.a & negativeMask; this->_registers.p.n = this->_registers.a & negativeMask;
} }
void CPU::SBC(uint24_t valueAddr)
{
}
} }