51 MCU header file

intrins.h

In C51 MCU programming, the functions in the header file INTRINS.H will make it as easy for you to use as in assembly.

Internal function description

_crol_ Characters rotate left

_cror_ Characters rotate right

_irol_ Integer circular left shift

_iror_ Integer rotate right

_lrol_ Circular left shift of long integer

_lror_ long integer circular right shift

_nop_ No operation 8051 NOP instruction

_testbit_ Test and clear bit 8051 JBC instruction

reg51.h

The operation of P1.1 in the at89x51.h file is written as P1_1

The operation on P1.1 in the reg51.h file is written as P1^1

It's just a different way of expressing it.

1 //Time:2017-2-11

2 //Project Name:reg51.h

3 //write by:cyt

4 /*-------------------------------------------------- ----------

5 REG51.H

6 Header file for generic 80C51 and 80C31 microcontroller.

7 Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.

8 All rights reserved.

9------------------------------------------------- -----------*/

10 #ifndef __REG51_H__

11 #define __REG51_H__

12 /* BYTE Register */

13 sfr P0 = 0x80;

14 sfr P1 = 0x90;

15 sfr P2 = 0xA0;

16 sfr P3 = 0xB0;

17 sfr PSW = 0xD0;

18 sfr ACC = 0xE0;

19 sfr B = 0xF0;

20 sfr SP = 0x81;

21 sfr DPL = 0x82;

22 sfr DPH = 0x83;

23 sfr PCON = 0x87;

24 sfr TCON = 0x88;

25 sfr TMOD = 0x89;

26 sfr TL0 = 0x8A;

27 sfr TL1 = 0x8B;

28 sfr TH0 = 0x8C;

29 sfr TH1 = 0x8D;

30 sfr IE = 0xA8;

31 sfr IP = 0xB8;

32 sfr SCON = 0x98;

33 sfr SBUF = 0x99;

34 /* BIT Register */

35 /* PSW */

36 sbit CY = 0xD7;

37 sbit AC = 0xD6;

38 sbit F0 = 0xD5;

39 sbit RS1 = 0xD4;

40 sbit RS0 = 0xD3;

41 sbit OV = 0xD2;

42 sbit P = 0xD0;

43 /* TCON */

44sbit TF1 = 0x8F;

45 sbit TR1 = 0x8E;

46 sbit TF0 = 0x8D;

47 sbit TR0 = 0x8C;

48 sbit IE1 = 0x8B;

49 sbit IT1 = 0x8A;

50 sbit IE0 = 0x89;

51 sbit IT0 = 0x88;

52 /* IE */

53 sbit EA = 0xAF;

54 sbit ES = 0xAC;

55 sbit ET1 = 0xAB;

56 sbit EX1 = 0xAA;

57 sbit ET0 = 0xA9;

58 sbit EX0 = 0xA8;

59 /* IP */

60 sbit PS = 0xBC;

61 sbit PT1 = 0xBB;

62 sbit PX1 = 0xBA;

63 sbit PT0 = 0xB9;

64 sbit PX0 = 0xB8;

65 /* P3 */

66 sbit RD = 0xB7;

67 sbit WR = 0xB6;

68 sbit T1 = 0xB5;

69 sbit T0 = 0xB4;

70 sbit INT1 = 0xB3;

71 sbit INT0 = 0xB2;

72sbit TXD = 0xB1;

73 sbit RXD = 0xB0;

74 /* SCON */

75 sbit SM0 = 0x9F;

76 sbit SM1 = 0x9E;

77 sbit SM2 = 0x9D;

78 sbit REN = 0x9C;

79 sbit TB8 = 0x9B;

80 sbit RB8 = 0x9A;

81 sbit TI = 0x99;

82 sbit RI = 0x98;

83 #endif

Definition, sbit has three uses:

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
For example, to define OV in PSW, you can use the following three methods:
sbit OV = 0xd2 (1) Description: 0xd2 is the bit address value of OV
sbit OV = PSW^2 (2) Description: PSW must be defined with sfr first
sbit OV = 0xD0^2 (3) Description: 0xD0 is the address value of PSW
Therefore, here we use sfr P1_0 = P1^0; which means that the symbol P1_0 is used to represent the P1.0 pin. If you want, you can also use a name like P10, as long as you change it in the following program.