鐢ㄧ姸鎬佹満瀵?/p>
ADC0809
鐨勯噰鏍锋帶鍒剁數璺疄鐜?/p>
1
銆佸疄楠岀洰鐨勶細瀛︿範鐢ㄧ姸鎬佹満瀵?/p>
A/D
杞崲鍣?/p>
ADC0809
鐨勯噰鏍锋帶鍒剁數璺殑瀹炵幇銆?/p>
2
銆佸疄楠屽師鐞嗭細
ADC0809
鏄?/p>
CMOS
鐨?/p>
8
浣?/p>
A/D
杞崲鍣紝鐗囧唴鏈?/p>
8
璺ā鎷熷紑鍏筹紝鍙帶鍒?/p>
8
涓?/p>
妯℃嫙閲忎腑鐨勪竴涓繘鍏ヨ浆鎹㈠櫒涓�?/p>
ADC0809
鐨勫垎杈ㄧ巼涓?/p>
8
浣嶏紝杞崲鏃堕棿绾?/p>
100us
锛屽惈閿佸瓨鎺у埗
鐨?/p>
8
璺璺紑鍏筹紝杈撳嚭鏈変笁鎬佺紦鍐插櫒鎺у埗锛屽崟
5V
鐢垫簮渚涚數銆?/p>
涓昏鎺у埗淇″彿璇存槑锛氬鍥?/p>
6-28
鎵�绀猴紝
START
鏄浆鎹㈠惎鍔ㄤ俊鍙凤紝楂樼數骞虫湁鏁堬紱
ALE
鏄?/p>
3
浣嶉�氶亾閫夋嫨鍦板潃锛?/p>
ADDC
銆?/p>
ADDB
銆?/p>
ADDA
锛変俊鍙风殑閿佸瓨淇″彿銆傚綋妯℃嫙閲忛�佽嚦鏌愪竴杈撳叆绔紙濡?/p>
IN1
鎴?/p>
IN2
绛夛級
锛岀敱
3
浣嶅湴鍧�淇″彿閫夋嫨锛岃�屽湴鍧�淇″彿鐢?/p>
ALE
閿佸瓨锛?/p>
EOC
鏄浆鎹㈡儏鍐电姸鎬佷俊鍙凤紙绫?/p>
浼间簬
AD574
鐨?/p>
STATUS
锛?/p>
锛屽綋鍚姩杞崲绾?/p>
100us
鍚庯紝
EOC
浜х敓涓�涓礋鑴夊啿锛屼互绀鸿浆鎹㈢粨鏉燂紱鍦?/p>
EOC
鐨勪笂鍗囨部鍚庯紝鑻ヤ娇杈撳嚭浣胯兘淇″彿
OE
涓洪珮鐢靛钩锛屽垯鎺у埗鎵撳紑涓夋�佺紦鍐插櫒锛屾妸杞崲濂界殑
8
浣嶆暟鎹粨鏋滆緭鑷虫暟鎹�荤嚎銆傝嚦姝?/p>
ADC0809
鐨勪竴娆¤浆鎹㈢粨鏉熶簡銆?/p>
銆愪緥
6-28
銆?/p>
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY ADCINT IS
PORT ( D : IN STD_LOGIC_VECTOR(7 DOWNTO 0); --0809
鐨?/p>
8
浣嶈浆鎹㈡暟鎹緭鍑?/p>
CLK ,EOC : IN STD_LOGIC; --CLK
鏄浆鎹㈠伐浣滄椂閽?/p>
LOCK1, ALE, START, OE, ADDA : OUT STD_LOGIC;
Q : OUT STD_LOGIC_VECTOR(7 DOWNTO 0) );
END ADCINT;
ARCHITECTURE behav OF ADCINT IS
TYPE states IS (st0, st1, st2, st3,st4,st5,st6) ; --
瀹氫箟鍚勭姸鎬佸瓙绫诲瀷
SIGNAL current_state, next_state: states :=st0 ;
SIGNAL REGL
: STD_LOGIC_VECTOR(7 DOWNTO 0);
SIGNAL LOCK
: STD_LOGIC; --
杞崲鍚庢暟鎹緭鍑洪攣瀛樻椂閽熶俊鍙?/p>
BEGIN
ADDA <= '1'; LOCK1 <=LOCK;
PRO: PROCESS(current_state,EOC) BEGIN --
瑙勫畾鍚勭姸鎬佽浆鎹㈡柟寮?/p>
CASE current_state IS
WHEN st0 => ALE<='0';START<='0';OE<='0';LOCK<='0' ;next_state <= st1;
WHEN st1 => ALE<='1';START<='0';OE<='0';LOCK<='0' ;next_state <= st2;
WHEN st2 => ALE<='0';START<='1';OE<='0';LOCK<='0' ;next_state <= st3;
WHEN st3 => ALE<='0';START<='0';OE<='0';LOCK<='0';
IF (EOC='1') THEN next_state <= st3; --
娴嬭瘯
EOC
鐨勪笅闄嶆部
ELSE next_state <= st4;
END IF ;
WHEN st4=> ALE<='0';START<='0';OE<='0';LOCK<='0';
IF (EOC='0') THEN next_state <= st4; --
娴嬭瘯
EOC
鐨勪笂鍗囨部锛?/p>
=1
琛ㄦ槑杞崲缁撴潫
ELSE next_state <= st5; --
缁х画绛夊緟
END IF ;
WHEN st5=> ALE<='0';START<='0';OE<='1';LOCK<='0';next_state <= st6;
WHEN st6=> ALE<='0';START<='0';OE<='1';LOCK<='1';next_state <= st0;
WHEN OTHERS => ALE<='0';START<='0';OE<='0';LOCK<='0';next_state <= st0;