core/insn_incdec_hl.v

   1 `define INSN_INCDEC_HL          9'b00011010x
   2
   3 `ifdef EXECUTE
   4         `INSN_INCDEC_HL: begin
   5                 case (cycle)
   6                 0:      `EXEC_READ(`_HL)
   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
  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
  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                         };
  28         end
  29 `endif