📄 serial0.v
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// 70H - 7Fh
parameter[7:0] JNZ = 8'b01110000;
parameter[7:0] ACALL_3 = 8'b01110001;
parameter[7:0] ORL_C_BIT = 8'b01110010;
parameter[7:0] JMP_A_DPTR = 8'b01110011;
parameter[7:0] MOV_A_N = 8'b01110100;
parameter[7:0] MOV_ADDR_N = 8'b01110101;
parameter[7:0] MOV_IR0_N = 8'b01110110;
parameter[7:0] MOV_IR1_N = 8'b01110111;
parameter[7:0] MOV_R0_N = 8'b01111000;
parameter[7:0] MOV_R1_N = 8'b01111001;
parameter[7:0] MOV_R2_N = 8'b01111010;
parameter[7:0] MOV_R3_N = 8'b01111011;
parameter[7:0] MOV_R4_N = 8'b01111100;
parameter[7:0] MOV_R5_N = 8'b01111101;
parameter[7:0] MOV_R6_N = 8'b01111110;
parameter[7:0] MOV_R7_N = 8'b01111111;
// 80H - 8Fh
parameter[7:0] SJMP = 8'b10000000;
parameter[7:0] AJMP_4 = 8'b10000001;
parameter[7:0] ANL_C_BIT = 8'b10000010;
parameter[7:0] MOVC_A_PC = 8'b10000011;
parameter[7:0] DIV_AB = 8'b10000100;
parameter[7:0] MOV_ADDR_ADDR = 8'b10000101;
parameter[7:0] MOV_ADDR_IR0 = 8'b10000110;
parameter[7:0] MOV_ADDR_IR1 = 8'b10000111;
parameter[7:0] MOV_ADDR_R0 = 8'b10001000;
parameter[7:0] MOV_ADDR_R1 = 8'b10001001;
parameter[7:0] MOV_ADDR_R2 = 8'b10001010;
parameter[7:0] MOV_ADDR_R3 = 8'b10001011;
parameter[7:0] MOV_ADDR_R4 = 8'b10001100;
parameter[7:0] MOV_ADDR_R5 = 8'b10001101;
parameter[7:0] MOV_ADDR_R6 = 8'b10001110;
parameter[7:0] MOV_ADDR_R7 = 8'b10001111;
// 90H - 9Fh
parameter[7:0] MOV_DPTR_N = 8'b10010000;
parameter[7:0] ACALL_4 = 8'b10010001;
parameter[7:0] MOV_BIT_C = 8'b10010010;
parameter[7:0] MOVC_A_DPTR = 8'b10010011;
parameter[7:0] SUBB_N = 8'b10010100;
parameter[7:0] SUBB_ADDR = 8'b10010101;
parameter[7:0] SUBB_IR0 = 8'b10010110;
parameter[7:0] SUBB_IR1 = 8'b10010111;
parameter[7:0] SUBB_R0 = 8'b10011000;
parameter[7:0] SUBB_R1 = 8'b10011001;
parameter[7:0] SUBB_R2 = 8'b10011010;
parameter[7:0] SUBB_R3 = 8'b10011011;
parameter[7:0] SUBB_R4 = 8'b10011100;
parameter[7:0] SUBB_R5 = 8'b10011101;
parameter[7:0] SUBB_R6 = 8'b10011110;
parameter[7:0] SUBB_R7 = 8'b10011111;
// A0H - AFh
parameter[7:0] ORL_C_NBIT = 8'b10100000;
parameter[7:0] AJMP_5 = 8'b10100001;
parameter[7:0] MOV_C_BIT = 8'b10100010;
parameter[7:0] INC_DPTR = 8'b10100011;
parameter[7:0] MUL_AB = 8'b10100100;
parameter[7:0] UNKNOWN = 8'b10100101;
parameter[7:0] MOV_IR0_ADDR = 8'b10100110;
parameter[7:0] MOV_IR1_ADDR = 8'b10100111;
parameter[7:0] MOV_R0_ADDR = 8'b10101000;
parameter[7:0] MOV_R1_ADDR = 8'b10101001;
parameter[7:0] MOV_R2_ADDR = 8'b10101010;
parameter[7:0] MOV_R3_ADDR = 8'b10101011;
parameter[7:0] MOV_R4_ADDR = 8'b10101100;
parameter[7:0] MOV_R5_ADDR = 8'b10101101;
parameter[7:0] MOV_R6_ADDR = 8'b10101110;
parameter[7:0] MOV_R7_ADDR = 8'b10101111;
// B0H - BFh
parameter[7:0] ANL_C_NBIT = 8'b10110000;
parameter[7:0] ACALL_5 = 8'b10110001;
parameter[7:0] CPL_BIT = 8'b10110010;
parameter[7:0] CPL_C = 8'b10110011;
parameter[7:0] CJNE_A_N = 8'b10110100;
parameter[7:0] CJNE_A_ADDR = 8'b10110101;
parameter[7:0] CJNE_IR0_N = 8'b10110110;
parameter[7:0] CJNE_IR1_N = 8'b10110111;
parameter[7:0] CJNE_R0_N = 8'b10111000;
parameter[7:0] CJNE_R1_N = 8'b10111001;
parameter[7:0] CJNE_R2_N = 8'b10111010;
parameter[7:0] CJNE_R3_N = 8'b10111011;
parameter[7:0] CJNE_R4_N = 8'b10111100;
parameter[7:0] CJNE_R5_N = 8'b10111101;
parameter[7:0] CJNE_R6_N = 8'b10111110;
parameter[7:0] CJNE_R7_N = 8'b10111111;
// C0H - CFh
parameter[7:0] PUSH = 8'b11000000;
parameter[7:0] AJMP_6 = 8'b11000001;
parameter[7:0] CLR_BIT = 8'b11000010;
parameter[7:0] CLR_C = 8'b11000011;
parameter[7:0] SWAP_A = 8'b11000100;
parameter[7:0] XCH_ADDR = 8'b11000101;
parameter[7:0] XCH_IR0 = 8'b11000110;
parameter[7:0] XCH_IR1 = 8'b11000111;
parameter[7:0] XCH_R0 = 8'b11001000;
parameter[7:0] XCH_R1 = 8'b11001001;
parameter[7:0] XCH_R2 = 8'b11001010;
parameter[7:0] XCH_R3 = 8'b11001011;
parameter[7:0] XCH_R4 = 8'b11001100;
parameter[7:0] XCH_R5 = 8'b11001101;
parameter[7:0] XCH_R6 = 8'b11001110;
parameter[7:0] XCH_R7 = 8'b11001111;
// D0H - DFh
parameter[7:0] POP = 8'b11010000;
parameter[7:0] ACALL_6 = 8'b11010001;
parameter[7:0] SETB_BIT = 8'b11010010;
parameter[7:0] SETB_C = 8'b11010011;
parameter[7:0] DA_A = 8'b11010100;
parameter[7:0] DJNZ_ADDR = 8'b11010101;
parameter[7:0] XCHD_IR0 = 8'b11010110;
parameter[7:0] XCHD_IR1 = 8'b11010111;
parameter[7:0] DJNZ_R0 = 8'b11011000;
parameter[7:0] DJNZ_R1 = 8'b11011001;
parameter[7:0] DJNZ_R2 = 8'b11011010;
parameter[7:0] DJNZ_R3 = 8'b11011011;
parameter[7:0] DJNZ_R4 = 8'b11011100;
parameter[7:0] DJNZ_R5 = 8'b11011101;
parameter[7:0] DJNZ_R6 = 8'b11011110;
parameter[7:0] DJNZ_R7 = 8'b11011111;
// E0H - EFh
parameter[7:0] MOVX_A_IDPTR = 8'b11100000;
parameter[7:0] AJMP_7 = 8'b11100001;
parameter[7:0] MOVX_A_IR0 = 8'b11100010;
parameter[7:0] MOVX_A_IR1 = 8'b11100011;
parameter[7:0] CLR_A = 8'b11100100;
parameter[7:0] MOV_A_ADDR = 8'b11100101;
parameter[7:0] MOV_A_IR0 = 8'b11100110;
parameter[7:0] MOV_A_IR1 = 8'b11100111;
parameter[7:0] MOV_A_R0 = 8'b11101000;
parameter[7:0] MOV_A_R1 = 8'b11101001;
parameter[7:0] MOV_A_R2 = 8'b11101010;
parameter[7:0] MOV_A_R3 = 8'b11101011;
parameter[7:0] MOV_A_R4 = 8'b11101100;
parameter[7:0] MOV_A_R5 = 8'b11101101;
parameter[7:0] MOV_A_R6 = 8'b11101110;
parameter[7:0] MOV_A_R7 = 8'b11101111;
// F0H - FFh
parameter[7:0] MOVX_IDPTR_A = 8'b11110000;
parameter[7:0] ACALL_7 = 8'b11110001;
parameter[7:0] MOVX_IR0_A = 8'b11110010;
parameter[7:0] MOVX_IR1_A = 8'b11110011;
parameter[7:0] CPL_A = 8'b11110100;
parameter[7:0] MOV_ADDR_A = 8'b11110101;
parameter[7:0] MOV_IR0_A = 8'b11110110;
parameter[7:0] MOV_IR1_A = 8'b11110111;
parameter[7:0] MOV_R0_A = 8'b11111000;
parameter[7:0] MOV_R1_A = 8'b11111001;
parameter[7:0] MOV_R2_A = 8'b11111010;
parameter[7:0] MOV_R3_A = 8'b11111011;
parameter[7:0] MOV_R4_A = 8'b11111100;
parameter[7:0] MOV_R5_A = 8'b11111101;
parameter[7:0] MOV_R6_A = 8'b11111110;
parameter[7:0] MOV_R7_A = 8'b11111111;
//-----------------------------------------------------------------
// Interrupt reset values
//-----------------------------------------------------------------
parameter[4:0] VECT_RV = 5'b00000; // Interrupt Vector reset value
parameter[3:0] IS_REG_RV = 4'b0000; // In Service Register reset value
//-----------------------------------------------------------------
// Interrupt Vector locations
//-----------------------------------------------------------------
// external interrupt 0
parameter[4:0] VECT_E0 = 5'b00000;
// timer 0 overflow
parameter[4:0] VECT_TF0 = 5'b00001;
// external interrupt 1
parameter[4:0] VECT_E1 = 5'b00010;
// timer 1 overflow
parameter[4:0] VECT_TF1 = 5'b00011;
// serial channel 0
parameter[4:0] VECT_SER0 = 5'b00100;
// timer 2 overflow/ext. reload
parameter[4:0] VECT_TF2 = 5'b00101;
// A/D converter
parameter[4:0] VECT_ADC = 5'b01000;
// external interrupt 2
parameter[4:0] VECT_EX2 = 5'b01001;
// external interrupt 3
parameter[4:0] VECT_EX3 = 5'b01010;
// external interrupt 4
parameter[4:0] VECT_EX4 = 5'b01011;
// external interrupt 5
parameter[4:0] VECT_EX5 = 5'b01100;
// external interrupt 6
parameter[4:0] VECT_EX6 = 5'b01101;
// serial channel 1
parameter[4:0] VECT_SER1 = 5'b10000;
//-----------------------------------------------------------------
// Start address location
//-----------------------------------------------------------------
parameter[15:0] ADDR_RV = 16'b0000000000000000; //
//-----------------------------------------------------------------
// RAM & SFR address reset value
//-----------------------------------------------------------------
parameter[7:0] RAM_SFR_ADDR_RV= 8'b00000000; //
//-----------------------------------------------------------------
// Data register reset value
//-----------------------------------------------------------------
parameter[7:0] DATAREG_RV = 8'b00000000; //
//-----------------------------------------------------------------
// High ordered half of address during indirect addressing
//-----------------------------------------------------------------
parameter[7:0] ADDR_HIGH_RI = 8'b00000000; //
//-----------------------------------------------------------------
// Watchdog Timer reset value
//-----------------------------------------------------------------
parameter[6:0] WDTH_RV = 7'b0000000; // High ordered WDT
parameter[7:0] WDTL_RV = 8'b00000000; // Low ordered WDT
//-----------------------------------------------------------------
// Watchdog Timer reset state
//-----------------------------------------------------------------
parameter[14:0] WDT_RS = 15'b111111111111100; // X"7FFC"
//*******************************************************************--
// Control signals inputs
input clk; // Global clock input
input rst; // Global reset input
input [3:0] cycle;
input rxd0i; // Serial 0 receive data
input t1ov; // Timer 1 overflow output
input smod; // Baud rate Doubler
// Serial interrupt flags
output ri0; // Serial 0 receive flag
wire ri0;
output ti0; // Serial 0 transmit flag
wire ti0;
// Serial outputs
output rxd0o; // Serial 0 receive clock
reg rxd0o;
output txd0; // Serial 0 transmit data
reg txd0;
// Special function register interface
input [7:0] sfrdatai;
output [7:0] sfrdataser0;
wire [7:0] sfrdataser0;
input [6:0] sfraddr;
input sfrwe;
//------------------------------------------------------------------
// Serial Port 0 Control register
reg [7:0] s0con;
// Serial Data Buffer 0
reg [7:0] s0buf_r;
// rxd0i input falling edge detector
reg rxd0_fall;
reg rxd0_ff;
reg rxd0_inff;
reg rxd0_val;
reg [2:0] rxd0_vec;
// Clock counter
reg [3:0] clk_count;
reg clk_ov2;
reg clk_ov4;
reg clk_ov12;
// Serial 0 clocks
reg b_clk;
// Timer 1 overflow counter
reg t1ov_rise;
reg t1ov_ff;
// Transmit baud counter
reg [3:0] t_baud_count;
reg t_baud_ov;
wire t_baud_clk; // baud clock for transmit
// Transmit shift register
reg [10:0] t_shift_reg;
wire t_shift_clk;
// Transmit shift counter
reg [3:0] t_shift_count;
// Transmit control signals
reg t_start;
// Receive baud counter
reg [3:0] r_baud_count;
// Receive shift register
reg [10:0] r_shift_reg;
// Receive shift counter
reg [3:0] r_shift_count;
// Receive control signal
reg r_start;
reg r_start_rise;
reg r_start_fall;
reg r_start_ff;
reg ri0_fall;
reg ri0_ff;
reg receive;
reg r_shift_temp;
reg r_start_ok;
// Baud Rate Generator Reload register
reg [7:0] s0rell;
reg [7:0] s0relh;
// Baud Rate Timer
reg [9:0] tim_baud;
// Baud Rate Generator control signals
reg baud_rate_ov;
reg [7:0] adcon;
reg baud_r_count;
wire baud_rate_clk;
wire baud_r_clk;
reg baud_r2_clk;
// RI and TI temporary registers
reg ri_tmp;
reg ri_spec_tmp;
wire ri_spec;
reg ti_tmp;
reg ti_spec_tmp;
wire ti_spec;
reg s0con2_tmp;
reg s0con2_spec_tmp;
wire s0con2_spec;
reg s0con2_val;
//------------------------------------------------------------------
// Serial 0 receive flag
// interrupt request flag
// high active output
//------------------------------------------------------------------
assign ri0 = s0con[0] ;
//------------------------------------------------------------------
// Serial 0 transmit flag
// interrupt request flag
// high active output
//------------------------------------------------------------------
assign ti0 = s0con[1] ;
//------------------------------------------------------------------
// Serial 0 temporary receive flag
//------------------------------------------------------------------
assign ri_spec = ri_spec_tmp | ri_tmp ;
//------------------------------------------------------------------
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