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3.4.2 WEAK PULL-UPS
Each of the PORTB pins has an individually configurable
internal weak pull-up. Control bits WPUB<7:0> enable or
disable each pull-up (see Register 3-7). Each weak
pull-up is automatically turned off when the port pin is
configured as an output. All pull-ups are disabled on a
Power-on Reset by the RBPU bit of the OPTION register.
Code: Select all
procedure init;
begin
TRISB := 1 ; // port B input
option_reg.7 := 0 ; // enable individual pull-up
WPUB := %11111111 ; // all port b are in weak pull-up
end;
Yes I figured it out my self that you must use the bits number not name, something you can use with other registers.piort wrote:hi,
you can tryHTH a bit ;-)Code: Select all
procedure init; begin TRISB := 1 ; // port B input option_reg.7 := 0 ; // enable individual pull-up WPUB := %11111111 ; // all port b are in weak pull-up end;
No, it enables those that have respective WPUB bit set. Naturally, you may assume that WPUB is $FF at power-up (default state). Just don't complain if some day your application misbehavesbrkovich wrote:Is the WPUB := %11111111 ; line needed if I wish all portb to have pull ups? Doesn't line option_reg.7 := 0 ; enables all at once?
.hello!!anikolic wrote:http://ww1.microchip.com/downloads/en/D ... df#page=493.4.2 WEAK PULL-UPS
Each of the PORTB pins has an individually configurable
internal weak pull-up. Control bits WPUB<7:0> enable or
disable each pull-up (see Register 3-7). Each weak
pull-up is automatically turned off when the port pin is
configured as an output. All pull-ups are disabled on a
Power-on Reset by the RBPU bit of the OPTION register.
Code: Select all
//test per i pull up interni
//OSSERVAZIONE
// per la porta a non funziona per la b si :-(
void main()
{
trisa=0xff;
ANSEL=0;
ANSELH=0;
trisc=0;
OPTION_REG = (OPTION_REG & 0b01111111);
WPUA=0xFF;
do
{
portc =(porta>>4);
}
while(1);
}I've written code like the one on datasheet but my keypad is still not working, so what's wrong with my code?hadv wrote:As usual it's all in the datasheet...read the section about PORTB or do a search for "pull"
It's explained in the datasheet:
In simple steps:Each of the PORTB pins has an individually configurable
internal weak pull-up. Control bits WPUB<7:0> enable or
disable each pull-up (see Register 3-7). Each weak
pull-up is automatically turned off when the port pin is
configured as an output. All pull-ups are disabled on a
Power-on Reset by the RBPU bit of the OPTION register.
Code depends on what you intend to do with RB1
Code: Select all
TRISB:=%11111101; // or %11111111 if RB1 should be an input as well
ANSELH:=%00000000; // or %00000100 if RB1 (AN10) is to be analog input
WPUB:=%00000010;
OPTION_REG.NOT_RBPU:=0;