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STC89LE53RC bảng dữ liệu(PDF) 164 Page - STCmicro Technology Co,.Ltd

tên linh kiện STC89LE53RC
Giải thích chi tiết về linh kiện  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
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Registers used in parameter passing
Number of Argument Char / 1-Byte Pointer INT / 2-Byte Pointer Long/Float
Generic Pointer
1
R7
R6 & R7
R4–R7
R1–R3
2
R5
R4 &R5
R4–R7
3
R3
R2 & R3
Since there are only eight registers in the 8051, there may be situations where we do not have enough regist-
ers for parameter passing. When this happens, the remaining parameters can be passed through fixed memory
loacations. To specify that all parameters will be passed via memory, the NOREGPARMs control directive is
used. To specify the reverse, use the REGPARMs control directive.
Return Values
Unlike parameters, which can be passed by using either registers or memory locations, output values must be
returned from functions via registers. The following table shows the registers used in returning different types of
values from functions.
Registers used in returning values from functions
Return Type
Register
Description
bit
Carry Flag (C)
char/unsigned char/1-byte pointer R7
int/unsigned int/2-byte pointer
R6 & R7
MSB in R6, LSB in R7
long/unsigned long
R4–R7
MSB in R4, LSB in R7
float
R4–R7
32-bit IEEE format
generic pointer
R1–R3
Memory type in R3, MSB in R2, LSB in R1
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