RS232 chargen reset problem

Apparently if I post an at-sign, even in a CODE block, the forum thinks i'm posting a link, even if I untick "Automatically parse links in text". Anyway I replaced them with *AT*

 
module rs232_send
  (
  input wire SYSCLK, // 50MHz
  input wire RST_B, // reset switch, active low
  output reg UART_TX
  );
 reg  COUNTER, COUNTER_N;
 wire SER_CLK;
 reg  TX_STATE, TX_STATE_N;
 reg  LETTER, LETTER_N;
 wire ENABLE;
 reg UART_TX_N;
 initial
 begin
  COUNTER <= 0;
  TX_STATE <= 0;
  TX_STATE_N <= 0;
  LETTER <= 7'h21; // start with '!' character
  LETTER_N <= 7'h21;
  UART_TX <= 1;
 end
 assign SER_CLK = (COUNTER == 9'd434); // 50MHz / 434 = 115207 (close enough)
 assign ENABLE = (LETTER != 7'h7e);
 always *AT* (posedge SYSCLK or negedge RST_B)
 begin
  if(!RST_B)
  begin
   COUNTER <= 0;
   TX_STATE <= 0;
   LETTER <= 7'h21;
   UART_TX <= 1;
  end
  else
  begin
   COUNTER <=# 1 COUNTER_N;
   TX_STATE <=# 1 TX_STATE_N;
   LETTER <=# 1 LETTER_N;
   UART_TX <=# 1 UART_TX_N;
  end
 end
 always *AT* (*)
 begin
  if(COUNTER == 9'd434)
   COUNTER_N = 0;
  else
   COUNTER_N = COUNTER + 9'h1;
 end
 always  *AT* (*)
 begin
  if(SER_CLK)
  begin
   case(TX_STATE)
     4'd0: UART_TX_N = 0; // start bit
     4'd1: UART_TX_N = LETTER; // first nibble
     4'd2: UART_TX_N = LETTER;
     4'd3: UART_TX_N = LETTER;
     4'd4: UART_TX_N = LETTER;
     4'd5: UART_TX_N = LETTER; // second nibble start
     4'd6: UART_TX_N = LETTER;
     4'd7: UART_TX_N = LETTER;
     4'd8: UART_TX_N = 0; // top bit is always zero, as ASCII is 7-bit
     4'd9: UART_TX_N = 1; // stop bit
     default: UART_TX_N = 1; // idle
    endcase
   end
  else
   UART_TX_N = UART_TX;
 end
 always *AT* (posedge SYSCLK)
 begin
 if(SER_CLK & ENABLE)
 begin
  if(TX_STATE == 4'd9)
  begin
   TX_STATE_N <= 4'h0;
   if(LETTER == 7'h7e)
    LETTER_N <= 7'h21;
   else
    LETTER_N <= LETTER + 7'h1;
  end
  else
  begin
   TX_STATE_N <= TX_STATE + 4'h1;
   LETTER_N <= LETTER;
  end
 end
 end
 endmodule