这段是复制例程中的，感觉不太对啊，求大家指教。记得书上写的是：SYSCLKOUT 是CAN 模块系统的时钟频率，与CPU 的时钟频率一样，那么对于150 MHz SYSCLKOUT ，CAN 模块系统的时钟频率也应该为150 MHz，那么下面这段的CAN clock是什么意思？又是如何计算出来的？记得书上公式中有个SYSCLKOUT /2，那么对于红 {MOD}部分，位速率=（150M/2）/10/15=500k才对啊，怎么会是1   Mbps呢？
/******************************************************/
/* Bit configuration parameters for 150 MHz SYSCLKOUT */
/******************************************************/
/*The table below shows how BRP(reg) field must be changed to achieve different bit
rates with a BT of 15, for a 80% SP:
---------------------------------------------------------------
BT = 15, TSEG1(reg) = 10, TSEG2(reg) = 2, Sampling Point = 80%
---------------------------------------------------------------
1   Mbps : BRP(reg)+1 = 10                 : CAN clock = 15 MHz
500 kbps : BRP(reg)+1 = 20                 : CAN clock = 7.5 MHz
250 kbps : BRP(reg)+1 = 40                 : CAN clock = 3.75 MHz
125 kbps : BRP(reg)+1 = 80                 : CAN clock = 1.875 MHz
100 kbps : BRP(reg)+1 = 100         : CAN clock = 1.5 MHz
50  kbps : BRP(reg)+1 = 200         : CAN clock = 0.75 MHz

The table below shows how to achieve different sampling points with a BT of 15:
----------------------------------------------------------------------
Achieving desired SP by changing TSEG1(reg) & TSEG2(reg) with BT = 15
----------------------------------------------------------------------

TSEG1(reg) = 10, TSEG2(reg) = 2, SP = 80%
TSEG1(reg) = 9, TSEG2(reg) = 3, SP = 73%
TSEG1(reg) = 8, TSEG2(reg) = 4, SP = 66%
TSEG1(reg) = 7, TSEG2(reg) = 5, SP = 60%

The table below shows how BRP(reg) field must be changed to achieve different bit
rates with a BT of 10, for a 80% SP:
--------------------------------------------------------------
BT = 10, TSEG1(reg) = 6, TSEG2(reg) = 1, Sampling Point = 80%
--------------------------------------------------------------
1   Mbps : BRP(reg)+1 = 15         : CAN clock = 10 MHz
500 kbps : BRP(reg)+1 = 30         : CAN clock = 5 MHz
250 kbps : BRP(reg)+1 = 60         : CAN clock = 2.5 MHz
125 kbps : BRP(reg)+1 = 120        : CAN clock = 1.25 MHz
100 kbps : BRP(reg)+1 = 150 : CAN clock = 1 MHz
50  kbps : BRP(reg)+1 = 300 : CAN clock = 0.5 MHz

*/

[ 本帖最后由 喜鹊王子 于 2013-8-8 09:59 编辑 ] 此帖出自小平头技术问答