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各位好,
我正在使用MSP430F5528, 想开发个低功耗的产品,对于USB只是希望它用来作为USART和PC通信,写些配置参数, 当然在做成产品后可能通过USB升级代码。
看了TI的USB开发库,其时钟配置都要用XT1或者XT2,请问下要用USB是否必须连接XT1 or XT2? 我想只用REFOCLK,不想外连接其他晶体,可行不?使用REFOCLK是否影响USB用于升级?
非常谢谢!
Hansen Fu
TI E2E上有类似的帖子 https://e2e.ti.com/support/microcontrollers/msp430/int-msp430/f/167/t/122101 您可以先参考下
数据手册http://www.ti.com.cn/cn/lit/ug/slau208n/slau208n.pdf的表格40.2
在Examples_Guide_MSP430_USB.pdf, Page 6,
"One hardware-specific resource is not configured in hal.c: the XT2 oscillator, on which a crystal/
or resonator is required for USB operation. This resource is owned by the USB API, and thus is
configured within the descriptors.h file. This file is generated by the Descriptor Tool, and so it
should be configured in the Tool. All the TI hardware listed above uses a 4MHz crystal on XT2."
这句话是说XT2必须配置么?