git.joshuawise.com / fpgaboy.git / blame
| Commit | Line | Data |
|---|---|---|
| e7fe9dc2 JW |
1 | `define INSN_INCDEC_HL 9'b00011010x |
| 2 | ||
| f2b745a7 JW |
3 | `ifdef EXECUTE |
| 4 | `INSN_INCDEC_HL: begin | |
| 5 | case (cycle) | |
| 6 | 0: `EXEC_READ(`_HL) | |
| 65d3506e JW |
7 | 1: begin |
| 8 | `EXEC_WRITE(`_HL, rdata + (opcode[0] ? 8'hFF : 8'h01)) | |
| 9 | tmp <= rdata + (opcode[0] ? 8'hFF : 8'h01); | |
| 10 | end | |
| f2b745a7 JW |
11 | 2: begin |
| 12 | `EXEC_INC_PC | |
| 13 | `EXEC_NEWCYCLE | |
| 14 | end | |
| 15 | endcase | |
| 16 | end | |
| 17 | `endif | |
| 18 | ||
| 19 | `ifdef WRITEBACK | |
| 20 | `INSN_INCDEC_HL: begin | |
| 65d3506e JW |
21 | if (cycle == 1) |
| 22 | `_F <= { | |
| 23 | (tmp == 8'h00) ? 1'b1 : 1'b0, /* Z */ | |
| 24 | opcode[0], /* N */ | |
| 25 | (tmp[3:0] == (opcode[0] ? 4'hF : 4'h0)) ? 1'b1 : 1'b0, | |
| 26 | `_F[4:0] | |
| 27 | }; | |
| f2b745a7 JW |
28 | end |
| 29 | `endif |