Newbie 74hc595 question

[bbarney]

the 16F684 does

[/QUOTE]Hello manjero, I think that Darrel missed the fact that you're using an 'F84. You can drop the:-

CMCON0 = 7
ANSEL = 0

The 'F84 doesn't have any analogue inputs to turn off or configure as digital IO. They're always digital IO. In fact, I have 16F84(A) selected, the compiler, (v 2.44), doesn't even recognise CMCON0.
[/QUOTE]

I built the circuit using 4 74hc595 cascaded and with a pic16f684 i had laying around with a 4 MHZ xtal.

[scarroll01]

the 16F684 does

Hello manjero, I think that Darrel missed the fact that you're using an 'F84. You can drop the:-

CMCON0 = 7
ANSEL = 0

The 'F84 doesn't have any analogue inputs to turn off or configure as digital IO. They're always digital IO. In fact, I have 16F84(A) selected, the compiler, (v 2.44), doesn't even recognise CMCON0.
[/QUOTE][/QUOTE]

Sorry, it's my failing eyesight. I didn't see the "6" and thought it was a PIC16F84.

... Steve

[bbarney]

I only seen the 6 cause I know Darrel doesn't miss anything

[Darrel Taylor]

I only seen the 6 cause I know Darrel doesn't miss anything

Uht-Oh, I'm getting a reputation.

I changed my code to this: ...

That's getting closer, but Wait, there's More.

The Latch Pin should start out LOW.
Then after the SHIFTOUT, the data gets latched by toggling it High/Low.

The pause only adds up to about 6000 (6 seconds).
For 60 Seconds, you need 60,000.

And the 595 is a really fast chip. pause 10 and Pulsout aren't needed.

bvar = 255

LOW  LPIN       ; Latch Idles LOW

' Shift out 32 - 1's to 74HC595's
Shiftout DPIN, CPIN, MSBFIRST,[bvar, bvar, bvar, bvar]

HIGH LPIN       ; Latch data to 595's outputs
LOW  LPIN

Low DPIN        ; Set Data to 0
                           
Main:
    pause 60000 ; Wait 1 minute

    HIGH CPIN   ; clock in a 0
    LOW  CPIN

    HIGH LPIN   ; Latch data to 595's outputs
    LOW  LPIN
GOTO Main

hth,