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[fpgaboy.git] / core / insn_incdec_hl.v
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1`define INSN_INCDEC_HL 9'b00011010x
2
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3`ifdef EXECUTE
4 `INSN_INCDEC_HL: begin
5 case (cycle)
6 0: `EXEC_READ(`_HL)
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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
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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
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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 };
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28 end
29`endif
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