STM32F203CB例程中CAN接收屏蔽不起作用是什么原因？

官方给的代码如下：
/* identifier/mask mode, One 32-bit filter, StdId: 0x317 */CAN_FilterInitSturcture.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitSturcture.CAN_FilterScale = CAN_FilterScale_32bit;
CAN_FilterInitSturcture.CAN_FilterIdHigh = 0x62E0;
CAN_FilterInitSturcture.CAN_FilterIdLow = 0;
CAN_FilterInitSturcture.CAN_FilterMaskIdHigh = 0xFFE0;  
CAN_FilterInitSturcture.CAN_FilterMaskIdLow = 0x0006;


经过实际测试发现这段代码能接受所有id不止0x317；

有人了解或者有官方的指导手册没有希望能够解决这个问题<img  alt="j_0057.gif">