Fixed LinuxDoc Tools issues in some verbatim blocks in the Atari document.

[cc65] / include / _6526.h

diff --git a/include/_6526.h b/include/_6526.h
index 2e72aec48ed38523af42d1d04ca6a5a4cdced7fe..aa3158dc8c3d69e53801f171ac08912f4ec36cde 100644 (file)
--- a/include/_6526.h
+++ b/include/_6526.h
@@ -1,8 +1,8 @@
 /*****************************************************************************/
 /*                                                                           */
-/*                                 _6526.h                                  */
+/*                                  _6526.h                                  */
 /*                                                                           */
-/*               Internal include file, do not use directly                 */
+/*                Internal include file, do not use directly                 */
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
@@ -38,24 +38,28 @@
 
 
 
-/* Define a structure with the 6526 register offsets */
+/* Define a structure with the 6526 register offsets.
+** NOTE: The timer registers are not declared as 16 bit registers, because
+** the order in which the two 8 bit halves are written is important, and
+** the compiler doesn't guarantee any order when writing 16 bit values.
+*/
 struct __6526 {
-    unsigned char      pra;            /* Port register A */
-    unsigned char      prb;            /* Port register B */
-    unsigned char      ddra;           /* Data direction register A */
-    unsigned char      ddrb;           /* Data direction register B */
-    unsigned char      ta_lo;          /* Timer A, low byte */
-    unsigned char      ta_hi;          /* Timer A, high byte */
-    unsigned char              tb_lo;          /* Timer B, low byte */
-    unsigned char      tb_hi;          /* Timer B, high byte */
-    unsigned char              tod_10;         /* TOD, 1/10 sec. */
-    unsigned char      tod_sec;        /* TOD, seconds */
-    unsigned char      tod_min;        /* TOD, minutes */
-    unsigned char      tod_hour;       /* TOD, hours */
-    unsigned char      sdr;            /* Serial data register */
-    unsigned char      icr;            /* Interrupt control register */
-    unsigned char      cra;            /* Control register A */
-    unsigned char      crb;            /* Control register B */
+    unsigned char       pra;            /* Port register A */
+    unsigned char       prb;            /* Port register B */
+    unsigned char       ddra;           /* Data direction register A */
+    unsigned char       ddrb;           /* Data direction register B */
+    unsigned char       ta_lo;          /* Timer A, low byte */
+    unsigned char       ta_hi;          /* Timer A, high byte */
+    unsigned char       tb_lo;          /* Timer B, low byte */
+    unsigned char       tb_hi;          /* Timer B, high byte */
+    unsigned char       tod_10;         /* TOD, 1/10 sec. */
+    unsigned char       tod_sec;        /* TOD, seconds */
+    unsigned char       tod_min;        /* TOD, minutes */
+    unsigned char       tod_hour;       /* TOD, hours */
+    unsigned char       sdr;            /* Serial data register */
+    unsigned char       icr;            /* Interrupt control register */
+    unsigned char       cra;            /* Control register A */
+    unsigned char       crb;            /* Control register B */
 };