2 * crt0.c - SDCC pic16 port runtime start code
5 * Converted for SDCC and pic16 port
6 * by Vangelis Rokas (vrokas@otenet.gr)
8 * based on Microchip MPLAB-C18 startup files
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2, or (at your option) any
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 * In other words, you are welcome to use, share and improve this program.
25 * You are forbidden to forbid anyone else to use, share and improve
26 * what you give them. Help stamp out software-hoarding!
28 * $Id: crt0.c 5183 2008-05-26 18:55:44Z tecodev $
34 /* external reference to the user's main routine */
35 extern void main (void);
37 void _entry (void) __naked __interrupt 0;
38 void _startup (void) __naked;
40 /* Access bank selector. */
45 * entry function, placed at interrupt vector 0 (RESET)
47 void _entry (void) __naked __interrupt 0
54 void _startup (void) __naked
57 ; Initialize the stack pointer
61 ; 1st silicon does not do this on POR
64 ; Initialize the flash memory access configuration.
65 ; This is harmless for non-flash devices, so we do it on all parts.
66 bsf 0xa6, 7, a ; EECON1.EEPGD = 1, TBLPTR accesses program memory
67 bcf 0xa6, 6, a ; EECON1.CFGS = 0, TBLPTR accesses program memory
70 /* Call the main routine. */
75 ; Returning from main will lock up.