20835的I2C中CNNT的作用

l0700830216

20835的I2C中CNNT的作用 [复制链接]

在使用过程中，这个CNNT位怎么感觉都一直不变的。

 

不管我发多少CNNT都不计数。

hlx3012

I2CCNT吧，这本来就不是计数器。

你看Table 6. Master-Transmitter/Receiver Bus Activity Defined by the RM, STT, and STP Bits of I2CMDR

l0700830216

嘿嘿，是I2CCNT。

 

 I2CCNT is a 16-bit register used to indicate how many data bytes to transfer when the I2C module is configured as a transmitter,or receive when configured as a master receiver. In the repeat mode(RM = 1), I2CCNT is not used.

 

从这句来看的话，觉得它就是个计数器。

 

 

 

l0700830216

哈哈，找到了   多谢胶哥

The value written to I2CCNT is copied to an internal data counter. The internal data counter is decremented by 1 for each byte transferred (I2CCNT remains unchanged).

嘿嘿，关键是后面括号里面的描述。