diff --git a/app/app.c b/app/app.c
index 1886c32..e4c926e 100644
--- a/app/app.c
+++ b/app/app.c
@@ -18,6 +18,7 @@
 
 #include "am_fix.h"
 #include "app/action.h"
+
 #ifdef ENABLE_AIRCOPY
 	#include "app/aircopy.h"
 #endif
@@ -436,8 +437,9 @@ void APP_StartListening(FUNCTION_Type_t function)
 	AUDIO_AudioPathOn();
 	gEnableSpeaker = true;
 
-	if (gSetting_backlight_on_tx_rx >= BACKLIGHT_ON_TR_RX)
+	if (gSetting_backlight_on_tx_rx != BACKLIGHT_ON_TR_OFF) {
 		BACKLIGHT_TurnOn();
+	}
 
 	if (gScanStateDir != SCAN_OFF)
 		CHFRSCANNER_Found();
@@ -1360,15 +1362,16 @@ void APP_TimeSlice500ms(void)
 		}
 	#endif
 
-	if (gBacklightCountdown > 0 && 
-		!gAskToSave && 
-		!gCssBackgroundScan &&
+	if (gBacklightCountdown_500ms > 0 &&  !gAskToSave &&  !gCssBackgroundScan &&
 		// don't turn off backlight if user is in backlight menu option
-		!(gScreenToDisplay == DISPLAY_MENU && (UI_MENU_GetCurrentMenuId() == MENU_ABR || UI_MENU_GetCurrentMenuId() == MENU_ABR_MAX)) 
-		) 
-	{	if (--gBacklightCountdown == 0)
-				if (gEeprom.BACKLIGHT_TIME < (ARRAY_SIZE(gSubMenu_BACKLIGHT) - 1)) // backlight is not set to be always on
-					BACKLIGHT_TurnOff();   // turn backlight off
+		!(gScreenToDisplay == DISPLAY_MENU && (UI_MENU_GetCurrentMenuId() == MENU_ABR || UI_MENU_GetCurrentMenuId() == MENU_ABR_MAX)))
+	{
+		if (--gBacklightCountdown_500ms == 0) {
+			if (gEeprom.BACKLIGHT_TIME < (ARRAY_SIZE(gSubMenu_BACKLIGHT) - 1)) {
+				// backlight is not set to be always on
+				BACKLIGHT_TurnOff();
+			}
+		}
 	}
 
 	if (gSerialConfigCountDown_500ms > 0)
@@ -1641,10 +1644,9 @@ static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 	}
 	else // key pressed or held
 	{
-		const uint8_t s = gSetting_backlight_on_tx_rx;
 		const int m = UI_MENU_GetCurrentMenuId();
 		if 	(	//not when PTT and the backlight shouldn't turn on on TX
-				!(Key == KEY_PTT && s != BACKLIGHT_ON_TR_TX && s != BACKLIGHT_ON_TR_TXRX) 
+				!(Key == KEY_PTT && !(gSetting_backlight_on_tx_rx & BACKLIGHT_ON_TR_TX))
 				// not in the backlight menu
 				&& !(gScreenToDisplay == DISPLAY_MENU && ( m == MENU_ABR || m == MENU_ABR_MAX || m == MENU_ABR_MIN))
 			) 
diff --git a/driver/backlight.c b/driver/backlight.c
index f3c3006..80dbd8d 100644
--- a/driver/backlight.c
+++ b/driver/backlight.c
@@ -22,7 +22,7 @@
 #include "settings.h"
 
 // this is decremented once every 500ms
-uint16_t gBacklightCountdown = 0;
+uint16_t gBacklightCountdown_500ms = 0;
 bool backlightOn;
 
 void BACKLIGHT_InitHardware()
@@ -54,42 +54,30 @@ void BACKLIGHT_InitHardware()
 
 void BACKLIGHT_TurnOn(void)
 {
-	if (gEeprom.BACKLIGHT_TIME != 0) {
-		backlightOn = true;
-		BACKLIGHT_SetBrightness(gEeprom.BACKLIGHT_MAX);
-	}
-	else {
+	if (gEeprom.BACKLIGHT_TIME == 0) {
 		BACKLIGHT_TurnOff();
 		return;
 	}
-		
-	switch (gEeprom.BACKLIGHT_TIME)
-	{
+
+	backlightOn = true;
+	BACKLIGHT_SetBrightness(gEeprom.BACKLIGHT_MAX);
+
+	switch (gEeprom.BACKLIGHT_TIME) {
 		default:
 		case 1:	// 5 sec
-			gBacklightCountdown = 5;
-			break;
 		case 2:	// 10 sec
-			gBacklightCountdown = 10;
-			break;
 		case 3:	// 20 sec
-			gBacklightCountdown = 20;
+			gBacklightCountdown_500ms = 1 + (2 << (gEeprom.BACKLIGHT_TIME - 1)) * 10;
 			break;
 		case 4:	// 1 min
-			gBacklightCountdown = 60;
-			break;
 		case 5:	// 2 min
-			gBacklightCountdown = 60 * 2;
-			break;
 		case 6:	// 4 min
-			gBacklightCountdown = 60 * 4;
+			gBacklightCountdown_500ms = 1 + (2 << (gEeprom.BACKLIGHT_TIME - 4)) * 120;
 			break;
 		case 7:	// always on
-			gBacklightCountdown = 0;
+			gBacklightCountdown_500ms = 0;
 			break;
 	}
-
-	gBacklightCountdown *= 2;
 }
 
 void BACKLIGHT_TurnOff()
@@ -106,7 +94,7 @@ void BACKLIGHT_TurnOff()
 #else
 	BACKLIGHT_SetBrightness(gEeprom.BACKLIGHT_MIN);
 #endif
-	gBacklightCountdown = 0;
+	gBacklightCountdown_500ms = 0;
 	backlightOn = false;
 }
 
diff --git a/driver/backlight.h b/driver/backlight.h
index 8ab3ee4..8119f90 100644
--- a/driver/backlight.h
+++ b/driver/backlight.h
@@ -20,7 +20,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-extern uint16_t gBacklightCountdown;
+extern uint16_t gBacklightCountdown_500ms;
 extern uint8_t gBacklightBrightness;
 
 #ifdef ENABLE_BLMIN_TMP_OFF
@@ -38,4 +38,3 @@ bool BACKLIGHT_IsOn();
 void BACKLIGHT_SetBrightness(uint8_t brigtness);
 
 #endif
-
diff --git a/functions.c b/functions.c
index 72674de..d2a4d86 100644
--- a/functions.c
+++ b/functions.c
@@ -244,9 +244,9 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 			else
 				BK4819_DisableScramble();
 
-			if (gSetting_backlight_on_tx_rx == BACKLIGHT_ON_TR_TX || 
-			    gSetting_backlight_on_tx_rx == BACKLIGHT_ON_TR_TXRX)
+			if (gSetting_backlight_on_tx_rx & BACKLIGHT_ON_TR_TX) {
 				BACKLIGHT_TurnOn();
+			}
 
 			break;
 
diff --git a/misc.c b/misc.c
index 888075a..592fb09 100644
--- a/misc.c
+++ b/misc.c
@@ -89,7 +89,7 @@ bool              gSetting_350EN;
 uint8_t           gSetting_F_LOCK;
 bool              gSetting_ScrambleEnable;
 
-uint8_t           gSetting_backlight_on_tx_rx;
+enum BacklightOnRxTx_t gSetting_backlight_on_tx_rx;
 
 #ifdef ENABLE_AM_FIX
 	bool          gSetting_AM_fix;
diff --git a/misc.h b/misc.h
index db00e9e..d635dca 100644
--- a/misc.h
+++ b/misc.h
@@ -153,7 +153,7 @@ extern bool                  gSetting_350EN;
 extern uint8_t               gSetting_F_LOCK;
 extern bool                  gSetting_ScrambleEnable;
 
-extern uint8_t               gSetting_backlight_on_tx_rx;
+extern enum BacklightOnRxTx_t gSetting_backlight_on_tx_rx;
 
 #ifdef ENABLE_AM_FIX
 	extern bool              gSetting_AM_fix;
@@ -338,4 +338,3 @@ int32_t NUMBER_AddWithWraparound(int32_t Base, int32_t Add, int32_t LowerLimit,
 unsigned long StrToUL(const char * str);
 
 #endif
-