w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 12

• Manufacturer Part Number: w77e58
• Description: 8 Bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

A brief description of the SFRs now follows.
PORT 0
Port 0 is an open-drain bi-directional I/O port. This port also provides a multiplexed low order
address/data bus during accesses to external memory.
STACK POINTER
The Stack Pointer stores the Scratchpad RAM address where the stack begins. In other words, it
always points to the top of the stack.
DATA POINTER LOW
This is the low byte of the standard 8052 16-bit data pointer.
DATA POINTER HIGH
This is the high byte of the standard 8052 16-bit data pointer.
DATA POINTER LOW1
Mnemonic: DPL
Mnemonic: P0
Mnemonic: SP
Mnemonic: DPH
Mnemonic: DPL1
Bit:
Bit:
Bit:
Bit:
Bit:
DPL1.7 DPL1.6 DPL1.5 DPL1.4 DPL1.3 DPL1.2 DPL1.1 DPL1.0
DPH.7
DPL.7
SP.7
P0.7
7
7
7
7
7
DPH.6
DPL.6
SP.6
P0.6
6
6
6
6
6
DPH.5
DPL.5
SP.5
P0.5
- 12 -
5
5
5
5
5
DPH.4
DPL.4
SP.4
P0.4
4
4
4
4
4
DPH.3
Preliminary W77E58
DPL.3
SP.3
P0.3
3
3
3
3
3
Address: 80h
Address: 81h
Address: 83h
Address: 84h
DPH.2
DPL.2
SP.2
P0.2
Address: 82h
2
2
2
2
2
DPH.1
DPL.1
SP.1
P0.1
1
1
1
1
1
DPH.0
DPL.0
SP.0
P0.0
0
0
0
0
0