X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/62316b58608c6d4333cc301b9906e13d143ba36e..4c90390a786b738c0dc0b8d55e7cc2d857f625de:/core/insn_add_sp_imm8.v

diff --git a/core/insn_add_sp_imm8.v b/core/insn_add_sp_imm8.v
index 3350bdc..ff5da37 100644
--- a/core/insn_add_sp_imm8.v
+++ b/core/insn_add_sp_imm8.v
@@ -20,7 +20,15 @@
 `ifdef WRITEBACK
 	`INSN_ADD_SP_IMM8: begin
 		case (cycle)
-		2:	`_SP <= `_SP + {rdata[7] ? 8'hFF : 8'h00, rdata};
+		2:	begin
+				`_SP <= `_SP + {rdata[7] ? 8'hFF : 8'h00, rdata};
+				`_F <= {
+					2'b00,
+					(({1'b0,`_SPL[3:0]} + {1'b0,rdata[3:0]}) & 5'h10) ? 1'b1 : 1'b0,
+					(({1'b0,`_SPL} + {1'b0,rdata}) & 9'h100) ? 1'b1 : 1'b0,
+					`_F[3:0]
+					};
+			end
 		endcase
 	end
 `endif