Question 1、
In the figure "The maximum frequency for the SCTimer/PWM clock is 100 MHz."
Is it only applicable for clock after SCTCLKSEL ?
Question 2、
If set CLKMODE=0 in SCTimer/PWM configuration register。Is there maximum frequency
limit for system clock ?
解決済! 解決策の投稿を見る。
Hi ZhaiYF
There are two type of input for SCT, the the 100MHz clock limitation is only valid for the clock source inputted from external pads (SCT_IN7), if you use system clock as the SCTimer/PWM clock source, the system clock frequency can be greater than 100MHz.
You can also see this "Remarks " immediately below "Select a function clock using SCTCLKSEL (Section 7.5.41)."
Hope this helps,
Jun Zhang
HI ZhaiYF
The Maximum freq for SCT is 100Mhz. any input freq. beyond this value is an invalided input and will have un-guaranteed behavior. also , the 100Mhz limit is mainly com from pad limitation. not the SCT module itself
Have a nice day,
Jun Zhang
HI Jun Zhang
Thanks.
Maybe I confused the SCTimer clock source and clock input.
Now, SCTimer does not need any external clock input except the system clock. I want to Confirm whether the SCTimer module can work stably if the system clock is greater than 100MHz, such as 180MHz.
The MCU used is lpc54618.
Hi ZhaiYF
There are two type of input for SCT, the the 100MHz clock limitation is only valid for the clock source inputted from external pads (SCT_IN7), if you use system clock as the SCTimer/PWM clock source, the system clock frequency can be greater than 100MHz.
You can also see this "Remarks " immediately below "Select a function clock using SCTCLKSEL (Section 7.5.41)."
Hope this helps,
Jun Zhang