[TY51822r3] add description on comment, fixed years

Author: ytsuboi

libraries/mbed/targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51.c

@@ -62,7 +62,14 @@ void SystemCoreClockUpdate(void)
 void SystemInit(void)
 {
 #if defined(TARGET_NRF_32MHZ_XTAL)
-    // For 32MHz external XTAL such as Taiyo Yuden
+    /* For 32MHz HFCLK XTAL such as Taiyo Yuden
+       Physically, tiny footprint XTAL oscillate higher freq. To make BLE modules smaller, some modules
+       are using 32MHz XTAL.
+       This code wriging the value 0xFFFFFF00 to the UICR (User Information Configuration Register)
+       at address 0x10001008, to make nRF51 works with 32MHz system clock. This register will be overwritten
+       by SoftDevice to 0xFFFFFFFF, the default value. Each hex files built with mbed classic online compiler
+       contain SoftDevice, so that, this code run once just after the hex file will be flashed onto nRF51.
+       After changing the value, nRF51 need to reboot. */
     if (*(uint32_t *)0x10001008 == 0xFFFFFFFF)
     {
         NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;

libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/TARGET_TY51822R3/PinNames.h

@@ -1,5 +1,5 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2013 Nordic Semiconductor
+ * Copyright (c) 2015 Nordic Semiconductor
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/TARGET_TY51822R3/device.h

@@ -1,5 +1,5 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2006-2013 ARM Limited
+ * Copyright (c) 2006-2015 ARM Limited
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.