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## digital watch

hello every one i have design digital watch second , minute , hour after i execute the code the counter second and minute counter ok work . for 0 to 59 but hour counter form 0 to 99 ?

i have question hour about how make counter to 0 to 24 or 0 to 12 ?

``` LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; ENTITY SEQ_COUNTER IS PORT ( CLK_1, RST : IN STD_LOGIC; CLK_2 : BUFFER STD_LOGIC; SEC_1, SEC_2 : BUFFER INTEGER RANGE 0 TO 9; MIN_1, MIN_2 : BUFFER INTEGER RANGE 0 TO 9; HR_1, HR_2 : BUFFER INTEGER RANGE 0 TO 9; Q : BUFFER INTEGER RANGE 0 TO 9 ); END SEQ_COUNTER; ARCHITECTURE SEQ_COUNTER OF SEQ_COUNTER IS BEGIN PROCESS (CLK_1,RST) VARIABLE S1, S2, M1, M2, H1, H2 :INTEGER RANGE 0 TO 10; BEGIN IF ( RST ='0' ) THEN S1 :=0; S2 :=0; M1 :=0; M2 :=0; H1 :=0; H2 :=0; SEC_1 <=0; SEC_2 <=0; MIN_1 <=0; MIN_2 <=0; HR_1 <=0; HR_2 <=0; Q <=0; ELSIF ( CLK_1'EVENT AND CLK_1 ='1') THEN S1 := S1 +1; IF ( S1 = 10) THEN S1 :=0; SEC_1 <=0; S2 := S2 +1; IF ( S2 = 6) THEN S2 :=0; SEC_2 <=0; M1 := M1 +1; IF ( M1 = 10) THEN M1 :=0; MIN_1 <=0; M2 := M2 +1; IF ( M2 = 6) THEN M2 :=0; MIN_2 <=0; H1 := H1 +1; IF ( H1 = 10) THEN H1 :=0; HR_1 <=0; H2 := H2 +1; IF ( H2 = 1 OR H1= 3 ) THEN H2 :=0; HR_2 <=0; END IF; END IF; END IF; END IF; END IF; END IF; END IF; SEC_1 <= S1; SEC_2 <= S2; MIN_1 <= M1; MIN_2 <= M2; HR_1 <= H1; HR_2 <= H2; END PROCESS; END SEQ_COUNTER; ```
11 Replies Honored Contributor I
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sure you mean 0 to 23, as 0 to 24 is 25 hours, which is longer than a normal earth day.

Questions:

why is everything a variable? you should only be using signals

dont use buffer - use an internal reference signal if you need to read it (or use VHDL 2008 and you can read output ports) Honored Contributor I
57 Views

yes bro 0 to 23 but i used this method there many way and work all sec and min but i have problem in condition the hour counter from 0 to 99 Honored Contributor I
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i want count from 0 to 23 Honored Contributor I
57 Views

I agree with trickys analysis, but I'd like to add two questions.

The hours are basically the same as the seconds and minutes, why do you handle them differently in your code?

You say the hour count runs from 0 up to 99, but as I read your code I can't see how H1 gets past 0. Don't you mean it runs from 00 up to 09? Honored Contributor I
57 Views

yes bro when i execution on broad show me hour counter from 00 to 99 but supposed work 00 to 24.....

``` IF ( H1 = 10) THEN H1 :=0; HR_1 <=0; H2 := H2 +1; IF ( H2 = 1 OR H1= 3 ) THEN H2 :=0; HR_2 <=0; END IF; ```

i change H2= 1 counter will show me counter 00 to 19 after that he rest again

``` IF ( H2 = 1 ) THEN H2 :=0; HR_2 <=0; END IF; ```

i change H2= 2 counter will show me counter 00 to 29 after that he rest again

``` IF ( H2 = 2 ) THEN H2 :=0; HR_2 <=0; END IF; ```

i change H2= 3 counter will show me counter 00 to 39 after that he rest again

``` IF ( H2 = 3 ) THEN H2 :=0; HR_2 <=0; END IF; ```

so how make counter to 00 to 24 or 00 to 12 Honored Contributor I
57 Views

????????????????? Honored Contributor I
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So why no one reply ???????? Honored Contributor I
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take a look at the order and conditions of your if statements

hint:10!=3 Honored Contributor I
57 Views

--- Quote Start ---

take a look at the order and conditions of your if statements

hint:10!=3

--- Quote End ---

thanks for reply bro i try many time

``` IF ( H1 = 10) THEN H1 :=0; HR_1 <=0; H2 := H2 +1; IF ( H2 = 1 OR H1= 3 ) THEN H2 :=0; HR_2 <=0; ```

h1 counter hour1 is count 0 1 2 3 4 5 6 7 8 9

when condition ``` IF ( H1 = 10) THEN H1 :=0; HR_1 <=0; H2 := H2 +1; ```

H2 = 1 will show us count from 0 to 1 so in broad show form 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

when i change H2 = 2 will show us count from 0 to 2 so in broad show form 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

so how make counter h2 count to 12 count? 0 1 2 3 4 5 6 7 8 9 10 11 12

or counter h2 count to 24 count? 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Honored Contributor I
57 Views

We all (or most of us) are doing this for fun in our own time, so sometimes we have other things to do, or are working on our own designs. It will help to get replies if you write what you have done and why instead of just dumping code and then expecting others to do your work for you. Having said that: if h1=10 it will never be 3, which you heck in the inner if statement or h1=3, so that idea doesn;t work. but why check on 10 and not 24, or use an extra if statement? Honored Contributor I
57 Views

--- Quote Start ---

We all (or most of us) are doing this for fun in our own time, so sometimes we have other things to do, or are working on our own designs. It will help to get replies if you write what you have done and why instead of just dumping code and then expecting others to do your work for you. Having said that: if h1=10 it will never be 3, which you heck in the inner if statement or h1=3, so that idea doesn;t work. but why check on 10 and not 24, or use an extra if statement?

--- Quote End ---

ok good question if we change h1= 23 the will count over 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 in logic but in physical in board will show until 9 after 0 0 0 0 0 0 0 in board coz one 7 segment

but my question is clear i understand the concept second and min but really confuse about hour coz h1=10 is right count 0 to 9 after that h2 = 2 count 0 to 2 result in board

0 1 2 and it will rest to 0 start again will be like that 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 