C8051F336/7/8/9
SFR Definition 12.3. SP: Stack Pointer
Bit
7
6
5
4
3
2
1
0
Name
Type
Reset
SP[7:0]
R/W
0
0
0
0
0
1
1
1
SFR Address = 0x81
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 incre-
mented before every PUSH operation. The SP register defaults to 0x07 after reset.
SFR Definition 12.4. ACC: Accumulator
Bit
7
6
5
4
3
2
1
0
Name
Type
Reset
ACC[7:0]
R/W
0
0
0
0
0
0
0
0
SFR Address = 0xE0; Bit-Addressable
Bit
Name
Function
7:0
ACC[7:0] Accumulator.
This register is the accumulator for arithmetic operations.
SFR Definition 12.5. B: B Register
Bit
7
6
5
4
3
2
1
0
Name
Type
Reset
B[7:0]
R/W
0
0
0
0
0
0
0
0
SFR Address = 0xF0; Bit-Addressable
Bit
Name
Function
7:0
B[7:0]
B Register.
This register serves as a second accumulator for certain arithmetic operations.
Rev. 0.2
79
SILICON [ SILICON ]
