About the use of 51 single chip microcomputer interrupt Using-EEWORLD

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interrupt 0 indicates external interrupt 0;

interrupt 1 indicates timer interrupt 0;
interrupt 2 indicates external interrupt 1;
interrupt 3 indicates timer interrupt 1;
interrupt 4 indicates a serial port interrupt;
 
using 0 is the 0th group of registers;
using 1 is the first group of registers;
using 2 is the second group of registers;
using 3 is the third group of registers;
 
The registers in the 51 microcontroller are R0--R7 (not R0-R3)
 
The actual address of R0-R7 in the data memory is determined by the RS1 and RS0 bits in the special function register PSW.
 
When using 0, set RS1 = 0, RS0 = 0, use the 0th group of registers, the actual address of R0--R7 in the data storage area is 00H-07H. R0 (00H) .... R7 (07H)
 
When using 1, set RS1 = 0, RS0 = 1, use the first group of registers, the actual address of R0--R7 in the data storage area is 00H-07H. R0 (08H) .... R7 (0FH)
 
When using 2, set RS1 = 1, RS0 = 0, use the second group of registers, the actual address of R0--R7 in the data storage area is 08H-0FH. R0 (10H) .... R7 (17H)
 
When using 3, set RS1 = 1, RS0 = 1, use the third group of registers, the actual address of R0--R7 in the data storage area is 00H-07H. R0 (18H) .... R7 (1FH)

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