diff --git a/src/hei_types.hpp b/src/hei_types.hpp
index 13bc72f..7f29f02 100644
--- a/src/hei_types.hpp
+++ b/src/hei_types.hpp
@@ -104,20 +104,20 @@
 using RegisterAddress_t = uint64_t;
 
 /**
- * The hardware access level of a register.
+ * The hardware register attribute flags.
  *
  * Values:
- *   The supported access levels are listed in this enum.
+ *   Each bit within this field represents an attribute flag. If the bit is 0,
+ *   the flag is disabled. If the bit is 1, the flag is enabled.
  *
  * Range:
  *   This is defined as a 1-byte field in the Chip Data Files.
  */
-enum RegisterAccessLevel_t : uint8_t
+enum RegisterAttributeFlags_t : uint8_t
 {
-    REG_ACCESS_NONE = 0x0, ///< No access
-    REG_ACCESS_RO   = 0x1, ///< Read-only access
-    REG_ACCESS_WO   = 0x2, ///< Write-only access
-    REG_ACCESS_RW   = 0x3, ///< Read/Write access
+    REG_ATTR_ACCESS_READ  = 0x80, ///< Register read access access
+    REG_ATTR_ACCESS_WRITE = 0x40, ///< Register write access access
+    REG_ATTR_RESERVED     = 0x3f, ///< Reserved/unused bits
 };
 
 /**
diff --git a/src/register/hei_hardware_register.cpp b/src/register/hei_hardware_register.cpp
index 0f994c0..bf9a55a 100644
--- a/src/register/hei_hardware_register.cpp
+++ b/src/register/hei_hardware_register.cpp
@@ -23,8 +23,7 @@
     // will be created in the cache, if it does not exist, when the cache is
     // accessed below.
 
-    auto al = getAccessLevel();
-    if ((REG_ACCESS_NONE != al) && (REG_ACCESS_WO != al))
+    if (queryAttrFlag(REG_ATTR_ACCESS_READ))
     {
         read(i_chip);
     }
@@ -45,8 +44,7 @@
     // will be created in the cache, if it does not exist, when the cache is
     // accessed below.
 
-    auto al = getAccessLevel();
-    if ((REG_ACCESS_NONE != al) && (REG_ACCESS_WO != al))
+    if (queryAttrFlag(REG_ATTR_ACCESS_READ))
     {
         read(i_chip);
     }
@@ -68,8 +66,7 @@
     if (i_force || !queryCache(i_chip))
     {
         // This register must be readable.
-        auto al = getAccessLevel();
-        HEI_ASSERT((REG_ACCESS_NONE != al) && (REG_ACCESS_WO != al));
+        HEI_ASSERT(queryAttrFlag(REG_ATTR_ACCESS_READ));
 
         // Get the buffer from the register cache.
         BitString& bs = accessCache(i_chip);
@@ -109,8 +106,7 @@
     verifyAccessorChip(i_chip);
 
     // This register must be writable.
-    auto al = getAccessLevel();
-    HEI_ASSERT((REG_ACCESS_NONE != al) && (REG_ACCESS_RO != al));
+    HEI_ASSERT(queryAttrFlag(REG_ATTR_ACCESS_WRITE));
 
     // An entry for this register must exist in the cache.
     HEI_ASSERT(queryCache(i_chip));
diff --git a/src/register/hei_hardware_register.hpp b/src/register/hei_hardware_register.hpp
index 81fb79b..fe71c75 100644
--- a/src/register/hei_hardware_register.hpp
+++ b/src/register/hei_hardware_register.hpp
@@ -43,17 +43,16 @@
   protected:
     /**
      * @brief Constructor from components.
-     * @param i_chipType    Type of chip associated with this register.
-     * @param i_id          Unique ID for this register.
-     * @param i_instance    Instance of this register
-     * @param i_accessLevel Hardware access level for this register.
+     * @param i_chipType Type of chip associated with this register.
+     * @param i_id       Unique ID for this register.
+     * @param i_instance Instance of this register
+     * @param i_flags    Attribute flags for this register.
      */
     HardwareRegister(ChipType_t i_chipType, RegisterId_t i_id,
-                     Instance_t i_instance,
-                     RegisterAccessLevel_t i_accessLevel) :
+                     Instance_t i_instance, RegisterAttributeFlags_t i_flags) :
         Register(),
         iv_chipType(i_chipType), iv_id(i_id), iv_instance(i_instance),
-        iv_accessLevel(i_accessLevel)
+        iv_flags(i_flags)
     {}
 
   private: // Instance variables
@@ -70,7 +69,7 @@
 
     /** The hardware access level of this register (read/write, read-only,
      *  write-only, etc.). */
-    const RegisterAccessLevel_t iv_accessLevel;
+    const RegisterAttributeFlags_t iv_flags;
 
   public: // Accessor functions
     /** @return The type of chip associated with this register. */
@@ -91,10 +90,10 @@
         return iv_instance;
     }
 
-    /** @return The hardware access level of this register. */
-    RegisterAccessLevel_t getAccessLevel() const
+    /** @return True if given flag is enabled, false if disabled. */
+    bool queryAttrFlag(RegisterAttributeFlags_t i_flag) const
     {
-        return iv_accessLevel;
+        return (0 != (iv_flags & i_flag));
     }
 
     // NOTE: The following are determined by child classes.
diff --git a/src/register/hei_scom_register.hpp b/src/register/hei_scom_register.hpp
index b93674a..d5921fd 100644
--- a/src/register/hei_scom_register.hpp
+++ b/src/register/hei_scom_register.hpp
@@ -18,16 +18,16 @@
   public: // Constructor, destructors, assignment, etc.
     /**
      * @brief Constructor from components.
-     * @param i_chipType    Type of chip associated with this register.
-     * @param i_id          Unique ID for this register.
-     * @param i_instance    Instance of this register
-     * @param i_accessLevel Hardware access level for this register.
-     * @param i_address     A 4-byte address for this SCOM register.
+     * @param i_chipType Type of chip associated with this register.
+     * @param i_id       Unique ID for this register.
+     * @param i_instance Instance of this register
+     * @param i_flags    Attribute flags for this register.
+     * @param i_address  A 4-byte address for this SCOM register.
      */
     ScomRegister(ChipType_t i_chipType, RegisterId_t i_id,
-                 Instance_t i_instance, RegisterAccessLevel_t i_accessLevel,
+                 Instance_t i_instance, RegisterAttributeFlags_t i_flags,
                  uint32_t i_address) :
-        HardwareRegister(i_chipType, i_id, i_instance, i_accessLevel),
+        HardwareRegister(i_chipType, i_id, i_instance, i_flags),
         iv_address(i_address)
     {}
 
@@ -99,16 +99,16 @@
   public: // Constructor, destructors, assignment, etc.
     /**
      * @brief Constructor from components.
-     * @param i_chipType    Type of chip associated with this register.
-     * @param i_id          Unique ID for this register.
-     * @param i_instance    Instance of this register
-     * @param i_accessLevel Hardware access level for this register.
-     * @param i_address     An 8-byte address for this Indirect SCOM register.
+     * @param i_chipType Type of chip associated with this register.
+     * @param i_id       Unique ID for this register.
+     * @param i_instance Instance of this register
+     * @param i_flags    Attribute flags for this register.
+     * @param i_address  An 8-byte address for this Indirect SCOM register.
      */
     IdScomRegister(ChipType_t i_chipType, RegisterId_t i_id,
-                   Instance_t i_instance, RegisterAccessLevel_t i_accessLevel,
+                   Instance_t i_instance, RegisterAttributeFlags_t i_flags,
                    uint64_t i_address) :
-        HardwareRegister(i_chipType, i_id, i_instance, i_accessLevel),
+        HardwareRegister(i_chipType, i_id, i_instance, i_flags),
         iv_address(i_address)
     {}