+
+ /**
+ * Enable pullup/pulldown resistor. When enabled, the output state is used
+ * to determine which resistor is enabled. When set(), the pull-up is
+ * enabled; when clr(), the pull-down is enabled.
+ */
+ async command void enableRen();
+
+ /**
+ * Disable pullup/pulldown resistor.
+ */
+ async command void disableRen();
+
+ /**
+ * Return true if pullup/pulldown resistor is enabled
+ */
+ async command bool isRen();