W79E201 Datasheet, PDF (10/87 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E201
Port 0
Bit:
7
P0.7
Mnemonic: P0
6
P0.6
5
P0.5
4
P0.4
3
P0.3
2
P0.2
1
P0.1
Address: 80h
0
P0.0
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
Bit:
7
SP.7
6
SP.6
5
SP.5
4
SP.4
3
SP.3
2
SP.2
1
SP.1
0
SP.0
Mnemonic: SP
Address: 81h
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
Bit:
7
6
5
4
3
DPL.7 DPL.6 DPL.5 DPL.4 DPL.3
Mnemonic: DPL
Address: 82h
This is the low byte of the standard 8052 16-bit data pointer.
2
DPL.2
1
DPL.1
0
DPL.0
Data Pointer High
Bit:
7
6
5
4
3
2
1
0
DPH.7 DPH.6 DPH.5 DPH.4 DPH.3 DPH.2 DPH.1 DPH.0
Mnemonic: DPH
Address: 83h
This is the high byte of the standard 8052 16-bit data pointer.
Power Control
Bit:
7
6
5
SM0D SMOD0 -
Mnemonic: PCON
4
3
2
1
0
-
GF1 GF0
PD
IDL
Address: 87h
BIT NAME
FUNCTION
7 SMOD 1: This bit doubles the serial port baud rate in mode 1, 2, and 3.
0: Framing Error Detection Disable. SCON.7 acts as per the standard 8052 function.
6 SMOD0 _{1: Framing Error Detection Enable, then and SCON.7 indicates a Frame Error and}
acts as the FE flag.
5
- Reserve
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