W78ERD2 Datasheet, PDF (11/72 Pages) Winbond – 8-BIT MICROCONTROLLER

W78ERD2
Port 4.0 High Address Comparator
Bit:
7
6
5
4
3
2
1
0
P40AH.7 P40AH.6 P40AH.5 P40AH.4 P40AH.3 P40AH.2 P40AH.1 P40AH.0
Mnemonic: P40AH
Address: 85h
Port Option Register
Bit:
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
P0PH
Mnemonic: POPT
Address: 86h
BIT NAME
FUNCTION
7
- Reserve
6
- Reserve
5
- Reserve
4
- Reserve
3
- Reserve
2
- Reserve
1
- Reserve
0: Disable Port 0 weak up.
1: Enable Port 0 weak up. The pins of Port 0 can be configured with either the
0 P0PH
open drain or standard port with internal pull-up. By the default, Port 0 is an
open drain bi-directional I/O port. When the P0UP bit in the POPT register is
set, the pins of port 0 will perform a bi-directional I/O port with internal pull-up
that is structurally the same Port2.
Power Control
Bit:
7
6
5
4
3
2
1
0
SMOD SMOD0 -
POR GF1 GF0
PD
IDL
Mnemonic: PCON
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 (FE_1) flag.
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Publication Release Date: April 20, 2005
Revision A4