http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb This work is licensed under a Creative Commons Attribution-Noncommercial 2.5 India License.Rickey's World Disclaimer Ajay Bhargav - contact@nospam.com contact@nospam.com Mon, 01 Dec 2008 23:28:23 -0800 Mon, 01 Dec 2008 23:28:23 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php http://www.8051projects.net/forum-t9505.html i am using pic12f629 ... which has 5 I/O and 1 always input GP 3,
i was trying to simulate the I/O setting in MPLAB IDE v7.3
this the code below...
BSF STATUS,5 ; go to bank 1
MOVLW b'00111000'; setting 3,4,5 input, 0,1,2 output
MOVWF TRISIO;
BCF STATUS,5; go back to bank 0
MOVLW 00h ; clear GPIO
MOVWF GPIO;

my problem is, wat i saw from the simulation mode, monitor on the TRISIO , i found that my TRISIO is always 0x08 instead of 0x38 (supposed like this 0x38) !!! i tried many combination again, its only changing the last four bit. why i cant change the bit 4 and bit 5 to input? please HELP....................................very frustated....]]> Mon, 12 May 2008 23:28:39 -0700 http://www.8051projects.net/forum-t9505.html http://www.8051projects.net/forum-t9505.html
In your case (in simulator) inputs are open and not connected to anything so ports (3,4,5) must read 0. Where as GPIO bit 3 will always read 1 (read datasheet for more information). and when MCLREN = 1 then GPIO bit 3 will always read 0.

Please read datasheet carefully.]]> Ajay<contact@nospam.com> Tue, 13 May 2008 15:34:58 -0700 http://www.8051projects.net/forum-t9505.html http://www.8051projects.net/forum-t9505.html i wan my GPIO3,4,5 as inputs and GPIO 0,1,2 as outputs. i read on the datasheet before i post. because i don understand on the MPLAB SIM, cos it never shows on the TRISIO that my GPIO 4,5 are the inputs. now u clear my mind.

thanks for your information.]]> nicholastyc<thamyc_2000@nospam.com> Tue, 13 May 2008 17:06:04 -0700 http://www.8051projects.net/forum-t9505.html http://www.8051projects.net/forum-t9505.html Ajay<contact@nospam.com> Wed, 14 May 2008 14:27:53 -0700 http://www.8051projects.net/forum-t9505.html http://www.8051projects.net/forum-t9505.html the trisio never show my GPIO 4 and 5 as input.

i just cant understand why..

my code
ORG 0x00
BCF STATUS,RP0;
MOVLW 00h ;
MOVWF GPIO;
BSF STATUS,RP0 ;
MOVLW 38h;
MOVWF TRISIO;
BCF STATUS,RP0;
then will go to main...

thanks..please correct my code if there is any problem..]]> nicholastyc<thamyc_2000@nospam.com> Wed, 14 May 2008 18:49:57 -0700 http://www.8051projects.net/forum-t9505.html