BSL下载msp430f4250时外部晶振是不是必须得接上啊?
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这个外部晶振是不需要的,下面的文章有详细介绍:
http://www.ti.com/lit/pdf/SLAU319
但是有一点要注意,就是串口波特率为固定的9600.
1.4 UART Protocol
The UART protocol applied here is defined as:
• Baud rate is fixed to 9600 baud in half-duplex mode (one sender at a time).
• Start bit, 8 data bits (LSB first), an even parity bit, 1 stop bit.
• Handshake is performed by an acknowledge character.
• Minimum time delay before sending new characters after characters have been received from the
MSP430 BSL: 1.2 ms
NOTE: Applying baud rates other than 9600 baud at initialization results in communication problems
or violates the flash memory write timing specification. The flash memory may be extensively
stressed or may react with unreliable program or erase operations.