C8051F39x/37x
SFR Definition 15.3. SP: Stack Pointer
Bit
7
6
5
4
3
2
1
0
SP[7:0]
R/W
Name
Type
Reset
0
0
0
0
0
1
1
1
SFR Address = 0x81; SFR Page = All Pages
Bit
Name
Function
7:0
SP[7:0]
Stack Pointer.
The Stack Pointer holds the location of the top of the stack. The
stack pointer is incremented before every PUSH operation. The
SP register defaults to 0x07 after reset.
SFR Definition 15.4. ACC: Accumulator
Bit
7
6
5
4
3
2
1
0
ACC[7:0]
R/W
Name
Type
Reset
0
0
0
0
0
0
0
0
SFR Address = 0xE0; SFR Page = All Pages; Bit-Addressable
Bit
Name
Function
7:0
ACC[7:0]
Accumulator.
This register is the accumulator for arithmetic operations.
Preliminary Rev. 0.71
87