mirror of https://github.com/cc65/cc65.git
72 lines
3.9 KiB
C
72 lines
3.9 KiB
C
/*****************************************************************************/
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/* */
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/* _6526.h */
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/* */
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/* Internal include file, do not use directly */
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/* */
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/* */
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/* */
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/* (C) 1998-2000 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef __6526_H
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#define __6526_H
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/* Define a structure with the 6526 register offsets.
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** NOTE: The timer registers are not declared as 16 bit registers, because
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** the order in which the two 8 bit halves are written is important, and
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** the compiler doesn't guarantee any order when writing 16 bit values.
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*/
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struct __6526 {
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unsigned char pra; /* Port register A */
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unsigned char prb; /* Port register B */
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unsigned char ddra; /* Data direction register A */
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unsigned char ddrb; /* Data direction register B */
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unsigned char ta_lo; /* Timer A, low byte */
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unsigned char ta_hi; /* Timer A, high byte */
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unsigned char tb_lo; /* Timer B, low byte */
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unsigned char tb_hi; /* Timer B, high byte */
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unsigned char tod_10; /* TOD, 1/10 sec. */
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unsigned char tod_sec; /* TOD, seconds */
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unsigned char tod_min; /* TOD, minutes */
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unsigned char tod_hour; /* TOD, hours */
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unsigned char sdr; /* Serial data register */
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unsigned char icr; /* Interrupt control register */
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unsigned char cra; /* Control register A */
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unsigned char crb; /* Control register B */
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};
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/* End of _6526.h */
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#endif
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