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Commit | Line | Data |
---|---|---|
1 | `define INSN_ADD_HL 9'b000xx1001 | |
2 | ||
3 | `ifdef EXECUTE | |
4 | `INSN_ADD_HL: begin | |
5 | case (cycle) | |
6 | 0: case (opcode[5:4]) | |
7 | `INSN_reg16_BC: {tmp,tmp2} <= `_BC; | |
8 | `INSN_reg16_DE: {tmp,tmp2} <= `_DE; | |
9 | `INSN_reg16_HL: {tmp,tmp2} <= `_HL; | |
10 | `INSN_reg16_SP: {tmp,tmp2} <= `_SP; | |
11 | endcase | |
12 | 1: begin | |
13 | `EXEC_INC_PC | |
14 | `EXEC_NEWCYCLE | |
15 | end | |
16 | endcase | |
17 | end | |
18 | `endif | |
19 | ||
20 | `ifdef WRITEBACK | |
21 | `INSN_ADD_HL: begin | |
22 | case (cycle) | |
23 | 0: {tmp,tmp2} <= `_HL + {tmp,tmp2}; | |
24 | 1: begin | |
25 | `_F <= { /* Z */ `_F[7], | |
26 | /* N */ 1'b0, | |
27 | /* H */ (({`_HL} + {tmp,tmp2}) & 16'h1000) ? 1'b1 : 1'b0, | |
28 | /* C */ (({1'b0,`_HL} + {1'b0,tmp,tmp2}) >> 16 == 1) ? 1'b1 : 1'b0, | |
29 | `_F[3:0] | |
30 | }; | |
31 | `_HL <= {tmp, tmp2}; | |
32 | end | |
33 | endcase | |
34 | end | |
35 | `endif |