Sign in

username:

password:



Not a member?

Search piclist



Search tips

Subscribe to piclist



piclist by Keywords

12F675 | 16F628 | 16F84 | 16f877 | 16F877A | 16F88 | 18F458 | ADC | AVR | Bootloader | CAN | CCS | CRC | EAGLE | EEPROM | ICD | ICSP | IDE | JDM | LED | Macros | Microchip | MPLAB | PCB-CAD | PIC10F | Pic12f675 | PIC16F84 | PIC16F84A | PIC16F877 | PIC18 | PIC18F452 | PicBasic | PICC | PICSTART | PWM | RS-485 | RS232 | SMT | SPI | UART | USART | USB | Wireless | Wisp628 | Xilinx

Ads

Discussion Groups

Discussion Groups | Piclist | PIC16F84A

A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.

PIC16F84A - Paul_Lav - Mar 16 13:11:00 2003

Hello,
 
Am using a pic16f84a. I had a problem with the TMR0 and PORTB when used as inputs. I got it to work by using 11000111 in OPTION_REG. When i used 00000111 all of PORTB went high. Could anyone explain this please?
 
Also if i define a port bit as an input and do not use it, not hold it low or anything, could this cause the pic to crash?
 
Cheers,
Paul


(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )


Re: PIC16F84A - Paul_Lav - Mar 17 12:49:00 2003

Yeah i did. I have now been informed about the Pull Up in the OPTION_REG i had it enabled so have now used 10000111 so to disable them.
 
Cheers!
 
Paul
----- Original Message -----
From: Milton Medicinteknik KB
To: Paul_Lav
Sent: Sunday, March 16, 2003 8:26 PM
Subject: Re: [piclist] PIC16F84A

Did you actually set he OptReg in Bank 1 ?
 
Sven
 
----- Original Message -----
From: Paul_Lav
To:    
Sent: Sunday, March 16, 2003 7:11 PM
Subject: [piclist] PIC16F84A

Hello,
 
Am using a pic16f84a. I had a problem with the TMR0 and PORTB when used as inputs. I got it to work by using 11000111 in OPTION_REG. When i used 00000111 all of PORTB went high. Could anyone explain this please?
 
Also if i define a port bit as an input and do not use it, not hold it low or anything, could this cause the pic to crash?
 
Cheers,
Paul


to unsubscribe, go to http://www.yahoogroups.com and follow the instructions

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.




(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: PIC16F84A - Paul_Lav - Mar 17 12:52:00 2003

Cheers, have now set the inputs as outputs!
Paul
----- Original Message -----
From: "cdb" <>
To: "Paul_Lav" <>
Sent: Sunday, March 16, 2003 10:44 PM
Subject: Re: [piclist] PIC16F84A > I haven't looked into your first problem, but the second one is - if
> you set unused pins to input, then you need to tie them high or low
> via a resistor - which is better depends on the chip and how much
> current it will consume.
>
> The alternative is to set unused pins to OUTPUT and have them set
> low.
>
> The main danger you have is shorting of unused pins, though it would
> also be possible for corruption of data to occur.
>
> Colin
> --
> cdb, on 17/03/2003
>
> I have always been a few Dendrites short of an Axon and believe me it
> shows.
>
> Light travels faster than sound. That's why some people appear bright
> until they speak!



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )