MCU C language bit definition-EEWORLD

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In the internal data memory of the 80C51 microcontroller, 20H~2FH is the bit operation area, in which each bit has its own bit address, and each bit can be operated. The bit address space is 00H~07FH, a total of 16*8=128 bits. The lowest bit of 20H is 00H, and the highest bit of 2FH is 7FH. For each bit of the special function register whose byte address is divisible by 8, it also has an addressable bit address, and its bit address system starts from 80H. The address of the special register is the same as the number of its lowest bit address. For example, if the address system of port P0 is 80H, then the lowest bit address system of port P0 is also 80H. Here, we need to distinguish between the address and the bit address. The former is the address of port P0, which has 8 bits, and each bit has a bit address. The lowest bit address is 80H, followed by 81H. They are separated in physical structure.

In C language we should define it like this:

bit a,c,d;

uchar bdata put_1;

sbit buzzer=put_1^0;

sbit led1=put_1^1;

sbit led2=put_1^2;

sbit led3=put_1^3;

sbit led4=put_1^4;

sbit run=put_1^5;

sbit up=put_1^6;

sbit down=put_1^7;

sbit led=P1^1;

Directly using labels in programming can bring convenience to programming.

Keywords：MCU Reference address：MCU C language bit definition

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