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W78ERD2 Datasheet(PDF) 11 Page - Winbond |
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W78ERD2 Datasheet(HTML) 11 Page - Winbond |
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11 / 72 page  W78ERD2 Publication Release Date: April 20, 2005 - 11 - Revision A4 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 P0PH 0: Disable Port 0 weak up. 1: Enable Port 0 weak up. The pins of Port 0 can be configured with either the 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. 6 SMOD0 0: Framing Error Detection Disable. SCON.7 acts as per the standard 8052 function. 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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