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W79E532A40DL Datasheet(PDF) 9 Page - Winbond |
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W79E532A40DL Datasheet(HTML) 9 Page - Winbond |
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9 / 78 page  W79E532A/W79L532A Publication Release Date: January 03, 2007 - 9 - Revision A7 A brief description of the SFRs is shown follows. Port 0 Bit: 7 6 5 4 3 2 1 0 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 Mnemonic: P0 Address: 80h 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 Bit: 7 6 5 4 3 2 1 0 SP.7 SP.6 SP.5 SP.4 SP.3 SP.2 SP.1 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 2 1 0 DPL.7 DPL.6 DPL.5 DPL.4 DPL.3 DPL.2 DPL.1 DPL.0 Mnemonic: DPL Address: 82h This is the low byte of the standard 8052 16-bit data pointer. 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 4 3 2 1 0 SM0D SMOD0 - - GF1 GF0 PD IDL Mnemonic: PCON Address: 87h 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 Error and acts as the FE flag. When SMOD0 is 0, then SCON.7 acts as per the standard 8052 function. GF1-0: These two bits are general purpose user flags. |
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