interface pic12F675 with the rs232

[Stefano_89]

Hi, i' ve to interface the pc's rs232 to and from the pic12F675..can you help me whit the program in assembler ?? thanks..

 

[Nigel Goodwin]

Check my tutorials, although written mostly for the 16F628 the 12F675 uses the same 14 bit core and the code only requires very minor changes.

 

[Stefano_89]

Check my tutorials, although written mostly for the 16F628 the 12F675 uses the same 14 bit core and the code only requires very minor changes.

thanks..but.. where is the program ?
apologise me..i'm fused

 

[Nigel Goodwin]

Click on my website, click on tutorials, click on RS232 tutorial.

 

[Mike - K8LH]

I've done some interrupt driven half-duplex (and full-duplex) demos for 12F675, 12F683, and 16F819 (the later two are published on PICLIST)...

Here's a 9600 baud half-duplex demo for the 12F675 that you're welcome to take a peek at;

;******************************************************************
;*                                                                *
;*  Filename: 12F675 Serial Demo 3.asm                            *
;*    Author: Mike McLaren, K8LH   (k8lh_at_arrl.net)             *
;*      Date: 16-Jan-06  (last revision 30-Mar-07)                *
;*                                                                *
;*   Half Duplex Bit-Banged 9600 Baud Serial I/O Demo             *
;*    (2-Pin Version with 8-Byte Circular RX Buffer)              *
;*                                                                *
;*  ·Uses 12F675 INTOSC running at 4-MHz                          *
;*  ·Bit rate error 0.16% plus or minus 1.0% for INTOSC           *
;*  ·Bit-banged 9600 baud serial I/O                              *
;*    ·Half Duplex (should not TX and RX simultaneously)          *
;*    ·TMR0 interrupts at 104-usec intervals (every 104           *
;*     instruction cycles) and IOC (interrupt on change)          *
;*     for RX start bit leading edge detection on RXPIN           *
;*    ·Circular 8-byte RX character buffer                        *
;*    ·Inverted TX and RX signals (MAX232A or similar             *
;*     inverting RS-232 interface required)                       *
;*  ·Relatively small - the ISR and the support routines          *
;*   Init232, Put232, Get232, and PutString use 124 words         *
;*   of code space at locations 0004 through 007F and 20          *
;*   of 64 RAM locations for variables and RX buffer...           *
;*  ·Worst case 51% ISR instruction cycle 'overhead'              *
;*   (54-usecs) when a complete RX character is added to          *
;*   the circular buffer once every 1.04-msecs...                 *
;*                                                                *
;*     MPLab: 7.30    (tabs=8)                                    *
;*     MPAsm: 5.01                                                *
;*                                                                *
;******************************************************************