Teensy LC doesn't support 9 bits on Serial2 & Serial3

teensy3/HardwareSerial.h

@@ -40,6 +40,9 @@
 //   folder.  The Windows installer puts Arduino in C:\Program Files (x86)\Arduino
 // On Macintosh, you must control-click Arduino and select "Show Package Contents", then
 //   look in Contents/Java/hardware/teensy/avr/cores/teensy3 to find this file.
+//
+// Teensy 3.x boards support 9 bit mode on all their serial ports
+// Teensy LC only supports 9 bit mode on Serial1.  Serial2 & Serial3 can't use 9 bits.
 
 
 #define SERIAL_7E1 0x02

teensy3/serial2.c

@@ -176,7 +176,7 @@ void serial2_format(uint32_t format)
 	c = UART1_C3 & ~0x10;
 	if (format & 0x20) c |= 0x10;		// tx invert
 	UART1_C3 = c;
-#ifdef SERIAL_9BIT_SUPPORT
+#if defined(SERIAL_9BIT_SUPPORT) && !defined(KINETISL)
 	c = UART1_C4 & 0x1F;
 	if (format & 0x08) c |= 0x20;		// 9 bit mode with parity (requires 10 bits)
 	UART1_C4 = c;

teensy3/serial3.c

@@ -158,7 +158,7 @@ void serial3_format(uint32_t format)
 	c = UART2_C3 & ~0x10;
 	if (format & 0x20) c |= 0x10;		// tx invert
 	UART2_C3 = c;
-#ifdef SERIAL_9BIT_SUPPORT
+#if defined(SERIAL_9BIT_SUPPORT) && !defined(KINETISL)
 	c = UART2_C4 & 0x1F;
 	if (format & 0x08) c |= 0x20;		// 9 bit mode with parity (requires 10 bits)
 	UART2_C4 = c;