w79e532 Winbond Electronics Corp America, w79e532 Datasheet - Page 10

• Manufacturer Part Number: w79e532
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

A brief description of the SFRs is shown 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. Besides, it has internal pull-up resisters
enabled by setting P0UP of P4CSIN (A2H) to high.
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.
Power Control
SMOD : This bit doubles the serial port baud rate in mode 1, 2, and 3 when set to 1.
SMOD0: Framing Error Detection Enable: When SMOD0 is set to 1, then SCON.7 indicates a Frame
GF1-0: These two bits are general purpose user flags.
Error and acts as the FE flag. When SMOD0 is 0, then SCON.7 acts as per the standard
8052 function.
Mnemonic: P0
Mnemonic: SP
Mnemonic: DPL
Mnemonic: DPH
Mnemonic: PCON
Bit:
Bit:
Bit:
Bit:
Bit:
DPH.7
DPL.7
SM0D
SP.7
P0.7
7
7
7
7
7
SMOD0
DPH.6
DPL.6
SP.6
P0.6
6
6
6
6
6
DPH.5
DPL.5
SP.5
P0.5
- 10 -
5
5
5
5
5
-
DPH.4
DPL.4
P0.4
SP.4
4
4
4
4
4
-
DPH.3
DPL.3
SP.3
P0.3
GF1
W79E532/W79L532
3
3
3
3
3
Address: 82h
Address: 87h
Address: 80h
Address: 81h
Address: 83h
DPH.2
DPL.2
SP.2
P0.2
GF0
2
2
2
2
2
DPH.1
DPL.1
P0.1
SP.1
PD
1
1
1
1
1
DPH.0
DPL.0
P0.0
SP.0
IDL
0
0
0
0
0