+#define SET_ANALOG_MODE() PA7 = 1
+
+/* Toggle the 1kHz calibration pin, only accurate up to ca. 8MHz. */
+/* Note: There's no PE2 as IOE is not bit-addressable (see TRM 15.2). */
+#define TOGGLE_CALIBRATION_PIN() IOE = IOE ^ 0x04
+
+#define LED_CLEAR() NOP
+#define LED_GREEN() NOP
+#define LED_RED() NOP
+