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[fpgaboy.git] / insn_incdec_reg8.v
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CommitLineData
1`ifdef EXECUTE
2 `INSN_INCDEC_reg8: begin
3 `EXEC_INC_PC
4 `EXEC_NEWCYCLE
5 case (opcode[5:3])
6 `INSN_reg_A: tmp <= `_A;
7 `INSN_reg_B: tmp <= `_B;
8 `INSN_reg_C: tmp <= `_C;
9 `INSN_reg_D: tmp <= `_D;
10 `INSN_reg_E: tmp <= `_E;
11 `INSN_reg_H: tmp <= `_H;
12 `INSN_reg_L: tmp <= `_L;
13 endcase
14 end
15`endif
16
17`ifdef WRITEBACK
18 `INSN_INCDEC_reg8: begin
19 case (opcode[5:3])
20 `INSN_reg_A: `_A <= tmp + (opcode[0] ? 8'hFF : 8'h01);
21 `INSN_reg_B: `_B <= tmp + (opcode[0] ? 8'hFF : 8'h01);
22 `INSN_reg_C: `_C <= tmp + (opcode[0] ? 8'hFF : 8'h01);
23 `INSN_reg_D: `_D <= tmp + (opcode[0] ? 8'hFF : 8'h01);
24 `INSN_reg_E: `_E <= tmp + (opcode[0] ? 8'hFF : 8'h01);
25 `INSN_reg_H: `_H <= tmp + (opcode[0] ? 8'hFF : 8'h01);
26 `INSN_reg_L: `_L <= tmp + (opcode[0] ? 8'hFF : 8'h01);
27 endcase
28 end
29`endif
Partial Nintendo GameBoy / GBZ80 implementation on a Xilinx FPGA
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