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Add CWAI command to the 6809
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
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@ -184,6 +184,7 @@ namespace EightBit {
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void cmp(uint8_t operand, uint8_t data);
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void cmp(register16_t operand, register16_t data);
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uint8_t com(uint8_t operand);
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void cwai(uint8_t data);
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uint8_t neg(uint8_t operand);
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register16_t m_d;
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@ -155,6 +155,9 @@ int EightBit::mc6809::executeUnprefixed(uint8_t opcode) {
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case 0x63: addCycles(6); BUS().write(com(AM_indexed_byte())); break; // COM (COM indexed)
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case 0x73: addCycles(7); BUS().write(com(AM_extended_byte())); break; // COM (COM extended)
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// CWAI
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case 0x3c: addCycles(20); cwai(AM_direct_byte()); break; // CWAI (CWAI direct)
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default:
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UNREACHABLE;
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}
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@ -449,3 +452,16 @@ uint8_t EightBit::mc6809::com(uint8_t operand) {
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setFlag(CC(), CF);
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return result;
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}
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void EightBit::mc6809::cwai(uint8_t data) {
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CC() &= data;
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pushWord(PC());
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pushWord(U());
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pushWord(Y());
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pushWord(X());
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push(DP());
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push(B());
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push(A());
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push(CC());
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halt();
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}
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