MPC5748G EMIOS_IC(24Bits RegA)

[1419428705]

需要实现的功能：检测周期重0us到2s的PWM波形，精度要做到0.1us，意味着counter值至少能表示2s的数字，需要24个bit来表示；
问题：MPC5748G,EMIOS功能，SAIC ,双边沿触发模式，clock :10Mhz;一个bit等于0.1us；当边沿触发后，读取到regA的值始终小于0xffff （调用EMIOS_GetUCregA();函数）,数据手册上说是24bit的数字; 希望能帮忙看下，如何才能读取到24bit的counter值

[PetrS]

Hi,

the implemented timer width is 16bit

 Thus the reading from A/B registers cannot be higher then 0xFFFF.

BR, Petr

[1419428705]

Hi,

 the regA width is 24bit;I read the counter from regA2 in  the mode of SAIC; In fact ,the counter width  is 16bit; Why did  the datasheet  tell me that the regA width is 24bit.

[PetrS]

Hi,

the register and functional description comes from the IP and so it may still contain info about 24bit width, but implemented is 16bit only on this device.

BR, Petr

[1419428705]

Hi,

if I want to read the system implemented timer, how to do it?

[PetrS]

if you meant STM module then you can refer to https://community.nxp.com/docs/DOC-343258 

BR, Petr