diff --git a/openlane/computer/config.tcl b/openlane/computer/config.tcl
index 4c6779a..f095139 100644
--- a/openlane/computer/config.tcl
+++ b/openlane/computer/config.tcl
@@ -25,6 +25,9 @@
 
 set ::env(VERILOG_FILES) "\
 	$::env(CARAVEL_ROOT)/verilog/rtl/defines.v \
+    $script_dir/../../verilog/rtl/jacaranda-8/UART/UART.v \
+    $script_dir/../../verilog/rtl/jacaranda-8/UART/rx.v \
+    $script_dir/../../verilog/rtl/jacaranda-8/UART/tx.v \
     $script_dir/../../verilog/rtl/jacaranda-8/alu.v \
     $script_dir/../../verilog/rtl/jacaranda-8/cpu.v \
     $script_dir/../../verilog/rtl/jacaranda-8/decoder.v \
diff --git a/verilog/rtl/jacaranda-8/UART/UART.v b/verilog/rtl/jacaranda-8/UART/UART.v
index 5ba66c6..9262a66 100644
--- a/verilog/rtl/jacaranda-8/UART/UART.v
+++ b/verilog/rtl/jacaranda-8/UART/UART.v
@@ -3,6 +3,7 @@
 
 module UART(
     input wire clk,
+    input wire reset,
     input wire tx_en,
     input wire rx_en,
     input wire begin_flag,
@@ -14,10 +15,10 @@
     output wire[7:0] rx_data,
     output wire busy_flag,
     output wire receive_flag,
-    output reg int_req = 1'b0
+    output reg int_req
 );
 
-    reg state = 1'b0;
+    reg state;
 
     always @(negedge clk) begin
         if(state == 1'b0) begin //データ待機中
@@ -36,8 +37,12 @@
             end
         end
     end
+    always @(posedge reset) begin
+        int_req <= 1'b0;
+        state   <= 1'b0;
+    end
 
-    tx tx1(clk, tx_en, begin_flag, tx_data, tx, busy_flag);
+    tx tx1(clk, reset, tx_en, begin_flag, tx_data, tx, busy_flag);
     rx rx1(clk, rx_en, rx, rx_data, receive_flag);
     
 endmodule
diff --git a/verilog/rtl/jacaranda-8/UART/tx.v b/verilog/rtl/jacaranda-8/UART/tx.v
index c3d8dda..f1ceadf 100644
--- a/verilog/rtl/jacaranda-8/UART/tx.v
+++ b/verilog/rtl/jacaranda-8/UART/tx.v
@@ -1,9 +1,10 @@
-module tx(clk, tx_en, begin_flag, data, tx, busy_flag);
+module tx(clk, reset, tx_en, begin_flag, data, tx, busy_flag);
     input wire clk;
+    input wire reset;
     input wire tx_en;
     input wire begin_flag;
     input wire[7:0] data;
-    output reg tx = 1'b1;
+    output reg tx;
     output wire busy_flag;
 
     parameter CLK_FREQ = 50_000_000;
@@ -18,6 +19,11 @@
     assign update_flag = (clk_count == CLK_COUNT_BIT - 32'd1);
     assign busy_flag = ~(state == 2'b00);
 
+    always @(posedge reset) begin
+        tx          <= 1'b1;
+        state       <= 2'b00;
+        bit_count   <= 3'd0;
+    end
     always @(posedge clk) begin
         case(state)
             2'b00: begin
diff --git a/verilog/rtl/jacaranda-8/computer.v b/verilog/rtl/jacaranda-8/computer.v
index 13dccf4..8879dd6 100644
--- a/verilog/rtl/jacaranda-8/computer.v
+++ b/verilog/rtl/jacaranda-8/computer.v
@@ -52,8 +52,11 @@
     wire [6:0] seg_out_2;
     wire [6:0] seg_out_3;
 /** **/
-
-    assign io_out[7:0] = pc;
+    // output enable
+    assign io_oeb[37:36] = 2'b11;
+    // UART - GPIO
+    assign io_out[37] = tx;
+    assign io_out[36] = rx;
 
     wire [7:0] instr;
     wire [7:0] pc;
@@ -176,19 +179,20 @@
         end
     end
 
-//    UART UART(.clk(wb_clk_i),
-//              .tx_en(tx_en),
-//              .rx_en(rx_en),
-//              .begin_flag(begin_flag),
-//              .rx(rx),
-//              .tx_data(tx_data),
-//              .tx(tx),
-//              .rx_data(rx_data),
-//              .busy_flag(busy_flag),
-//              .receive_flag(receive_flag),
-//              .int_req(int_req),
-//              .access_addr(rs_data),
-//              .reg_w_en(reg_w_en));
+    UART UART(.clk(wb_clk_i),
+              .reset(reset),
+              .tx_en(tx_en),
+              .rx_en(rx_en),
+              .begin_flag(begin_flag),
+              .rx(rx),
+              .tx_data(tx_data),
+              .tx(tx),
+              .rx_data(rx_data),
+              .busy_flag(busy_flag),
+              .receive_flag(receive_flag),
+              .int_req(int_req),
+              .access_addr(rs_data),
+              .reg_w_en(reg_w_en));
 //
 //    LED4 LED4(.in_data(led_in_data),
 //              .begin_flag(led_begin_flag),
diff --git a/verilog/rtl/uprj_netlists.v b/verilog/rtl/uprj_netlists.v
index 67113ee..c8c2487 100644
--- a/verilog/rtl/uprj_netlists.v
+++ b/verilog/rtl/uprj_netlists.v
@@ -25,6 +25,9 @@
 `else
     `include "user_project_wrapper.v"
     `include "user_proj_example.v"
+    `include "jacaranda-8/UART/UART.v"
+    `include "jacaranda-8/UART/rx.v"
+    `include "jacaranda-8/UART/tx.v"
     `include "jacaranda-8/alu.v"
     `include "jacaranda-8/cpu.v"
     `include "jacaranda-8/decoder.v"