怎么修改SPI寄存器

大家好，
我正在研究STM8AL3166并尝试修改SPI寄存器。
我的简单代码如下：
int main（）{
SPI_CR1 | = 0b00100100; / *配置为主设备和500 kHz com速度
}
正如数据表中所读，我用正确的地址创建了一个library.h：
// STM8AL3166 SPI寄存器

#define SPI_CR1 *（unsigned char *）0x5200 // SPI控制寄存器1但是当我进入调试会话时，寄存器在执行指令后不会改变其值
有人遇到过这个问题吗？例如，当我对GPIO端口A执行相同操作时，我没有问题。
我可能在某个地方错过了一个配置吗？
请帮忙。
感谢您的时间，
大卫



以下为原文




Hello Everyone,





I am working on the STM8AL3166 and try modify the SPI register.
My simple code is as below :
int main() {
   SPI_CR1 |= 0b00100100;      /* Configure as master and 500 kHz com speed
}
As read in the datasheet, I made a library.h with the correct address :
//STM8AL3166 SPI REGISTER

#define SPI_CR1 *(unsigned char*) 0x5200       //SPI Control Register 1   But when I go in the debug session, the register does not change his value after executing the instruction
Is someone has encountered this problem? When I do the same for GPIO port A for instance, I have no problem.
May I am missing one configuration somewhere?
Please help.
Thank you for your time,
David