In the C language . If you write P1.O directly, the C compiler does not recognize it, and P1.O is not a legal C language variable name, so you have to give it another name, such as the name P1-0, but P1-0 is Isn't it P10?
It can be said that C compilers don't think so, so they must be connected. Here, KeilC's keyword sbit is used. To define. Sbit is an extended data type in C51 that allows access to addressable bits in the internal RAM of the chip or addressable bits in special function registers.
Sbit is a bit variable that defines a special function register. Both bit and sbit are variable types of C51 extensions. A typical application is: sbit P0_0 = P0^0; / / that defines P0_0 as the first bit of the P0 port for bit operations. Bit and int char are similar, except that char=8 bits and bit=1 bits. Both are variables, and the compiler allocates addresses during compilation.
The first method: sbit bit variable name = address value
The second method: sbit bit variable name = SFR name ^ variable bit address value
The third method: sbit bit variable name = SFR address value ^ variable bit address value
(1) sbitOV=0xd2 Description:
0xd2 is the bit address value of OV, so that the absolute address of the bit is assigned to the bit variable.
The bit address of sbit must be between 80F_FFI-1.
(2) sbitOV=PSW^2 Description:
The PSW must be defined by sfr first. First define a special function register name and then specify the location of the bit variable name. This method can be used when the addressable bit is in the special function register.
(3) sbitOV=0xDO^2 Description:
0xDO is the address value of the PSW.
Therefore, the use of sbitP1 - 0 = P1 ^ 0 is defined by the symbol P1 - O to indicate the P1.0 pin, of course, if you prefer, you can use the name of the P10, as long as the following procedures are also changed. Similarly, we can use the address of P1.1 to write, such as sbjtP1—1=Ox91: In the future program statement, P1—1 can be used to read and write the P1.1 pin.
Usually we can directly use the simple name of each special function register defined in the pre-processing file provided by the system, and the direct reference can save a little time. Of course, you can also write your own definition file, using the name you think is easy to remember.
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