Things like sfr P0M0 = 0X94//POM 1 will be changed to these addresses when compiling.
sfr p 1m 1 = 0x 9 1； //mcu also operates on these addresses at runtime.
sfr p 1m 0 = 0x 92；
sfr p2m 1 = 0x 95；
sfr P2M0 = 0X96
uchar CONT _ 1； //Define a constant as a counter with the type of unsigned integer.
p0m 1 = 0； //Set the io port to push-pull output.
p 1m 1 = 0； //The following things define the initial values of these registers.
p2m 1 = 0； //Avoid errors when using these registers for the first time.
P0M0 = 0XFF
p 1m 0 = 0x ff；
P2M0 = 0XFF