git.sur5r.net Git - cc65/blob - 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