flash写入（二）

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//******************************************************************************
//  MSP430F552x 例程 - Flash In-System Programming w/ 在地址0x1800长字写入
// 这段程序首先擦除flash seg D, 然后在地址0x1800写入一个32-bit的数据
//  ACLK = REFO = 32kHz, MCLK = SMCLK = default DCO 1048576Hz
//
//                MSP430x552x
//            -----------------
//        /|\|              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//
//
//   Bhargavi Nisarga
//   Texas Instruments Inc.
//   April 2009
//   Built with CCSv4 and IAR Embedded Workbench Version: 4.21
//******************************************************************************

#include <msp430.h>

int main(void)
{
    
    
  unsigned long * Flash_ptrD;               // 初始化Seg D指针
  unsigned long value;
  WDTCTL = WDTPW+WDTHOLD;                   // 关闭看门狗

  Flash_ptrD = (unsigned long *) 0x1800;    // 初始化Flash pointer
  value = 0x12345678;                       // 初始化Value
  FCTL3 = FWKEY;                            // Clear Lock bit
  FCTL1 = FWKEY+ERASE;                      // Set Erase bit
  *Flash_ptrD = 0;                          // Dummy write to erase Flash seg
  FCTL1 = FWKEY+BLKWRT;                     // Enable long-word write
  *Flash_ptrD = value;                      // Write to Flash
  FCTL1 = FWKEY;                            // Clear WRT bit
  FCTL3 = FWKEY+LOCK;                       // Set LOCK bit
  while(1);                                 // Loop forever, SET BREAKPOINT HERE
}