8-bit MicrocontrollersのトピックSome doubts about MC9S08DZ60 clock https://community.nxp.com/t5/8-bit-Microcontrollers/Some-doubts-about-MC9S08DZ60-clock/m-p/653951#M22312 <HTML><HEAD></HEAD><BODY><P>Hi, guys</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I have some doubts about MC9S08DZ60 below, any help would be greatly appreciated!</P><P>1. In page 3 of HC S08 Microcontroller datasheet (MC9S08DZ60 Rev.4 6/2008, the same below), it said <EM>40-MHz HCS08 CPU (20-MHz bus) .</EM> If this means that the system clock can not exceed 40MHz? If it exceeds, what would be the consequences?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>2. If the bus clock is generated from a PLL, and the CAN clock source is bus clock, what would be the consequences? Would the CAN communication be unstable?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>3. In page 314 of the datasheet, it said&nbsp; <EM>When selecting a clock source, ensure that the clock source is properly enabled (if applicable) to ensure correct operation of the RTC</EM>.</P><P>My question is if PLL is selected as the clock source, can't the RTI be used? &nbsp;</P></BODY></HTML> Thu, 08 Dec 2016 02:34:51 GMT jasoncui 2016-12-08T02:34:51Z Some doubts about MC9S08DZ60 clock https://community.nxp.com/t5/8-bit-Microcontrollers/Some-doubts-about-MC9S08DZ60-clock/m-p/653951#M22312 <HTML><HEAD></HEAD><BODY><P>Hi, guys</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I have some doubts about MC9S08DZ60 below, any help would be greatly appreciated!</P><P>1. In page 3 of HC S08 Microcontroller datasheet (MC9S08DZ60 Rev.4 6/2008, the same below), it said <EM>40-MHz HCS08 CPU (20-MHz bus) .</EM> If this means that the system clock can not exceed 40MHz? If it exceeds, what would be the consequences?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>2. If the bus clock is generated from a PLL, and the CAN clock source is bus clock, what would be the consequences? Would the CAN communication be unstable?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>3. In page 314 of the datasheet, it said&nbsp; <EM>When selecting a clock source, ensure that the clock source is properly enabled (if applicable) to ensure correct operation of the RTC</EM>.</P><P>My question is if PLL is selected as the clock source, can't the RTI be used? &nbsp;</P></BODY></HTML> Thu, 08 Dec 2016 02:34:51 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Some-doubts-about-MC9S08DZ60-clock/m-p/653951#M22312 jasoncui 2016-12-08T02:34:51Z