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[cc65] / include / _6526.h
1 /*****************************************************************************/
2 /*                                                                           */
3 /*                                  _6526.h                                  */
4 /*                                                                           */
5 /*                Internal include file, do not use directly                 */
6 /*                                                                           */
7 /*                                                                           */
8 /*                                                                           */
9 /* (C) 1998-2000 Ullrich von Bassewitz                                       */
10 /*               Wacholderweg 14                                             */
11 /*               D-70597 Stuttgart                                           */
12 /* EMail:        uz@musoftware.de                                            */
13 /*                                                                           */
14 /*                                                                           */
15 /* This software is provided 'as-is', without any expressed or implied       */
16 /* warranty.  In no event will the authors be held liable for any damages    */
17 /* arising from the use of this software.                                    */
18 /*                                                                           */
19 /* Permission is granted to anyone to use this software for any purpose,     */
20 /* including commercial applications, and to alter it and redistribute it    */
21 /* freely, subject to the following restrictions:                            */
22 /*                                                                           */
23 /* 1. The origin of this software must not be misrepresented; you must not   */
24 /*    claim that you wrote the original software. If you use this software   */
25 /*    in a product, an acknowledgment in the product documentation would be  */
26 /*    appreciated but is not required.                                       */
27 /* 2. Altered source versions must be plainly marked as such, and must not   */
28 /*    be misrepresented as being the original software.                      */
29 /* 3. This notice may not be removed or altered from any source              */
30 /*    distribution.                                                          */
31 /*                                                                           */
32 /*****************************************************************************/
33
34
35
36 #ifndef __6526_H
37 #define __6526_H
38
39
40
41 /* Define a structure with the 6526 register offsets.
42  * NOTE: The timer registers are not declared as 16 bit registers, because
43  * the order in which the two 8 bit halves are written is important, and
44  * the compiler doesn't guarantee any order when writing 16 bit values.
45  */
46 struct __6526 {
47     unsigned char       pra;            /* Port register A */
48     unsigned char       prb;            /* Port register B */
49     unsigned char       ddra;           /* Data direction register A */
50     unsigned char       ddrb;           /* Data direction register B */
51     unsigned char       ta_lo;          /* Timer A, low byte */
52     unsigned char       ta_hi;          /* Timer A, high byte */
53     unsigned char       tb_lo;          /* Timer B, low byte */
54     unsigned char       tb_hi;          /* Timer B, high byte */
55     unsigned char       tod_10;         /* TOD, 1/10 sec. */
56     unsigned char       tod_sec;        /* TOD, seconds */
57     unsigned char       tod_min;        /* TOD, minutes */
58     unsigned char       tod_hour;       /* TOD, hours */
59     unsigned char       sdr;            /* Serial data register */
60     unsigned char       icr;            /* Interrupt control register */
61     unsigned char       cra;            /* Control register A */
62     unsigned char       crb;            /* Control register B */
63 };
64
65
66
67 /* End of _6526.h */
68 #endif
69
70
71