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W83787IF Datasheet(PDF) 6 Page - Winbond |
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W83787IF Datasheet(HTML) 6 Page - Winbond |
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6 / 123 page  W83787IF Publication Release Date:Sep 1995 - 6 - Revision A1 Serial Port Interface, continued SYMBOL PIN I/O FUNCTION RTSA HPRTAS1 36 I/O UART A Request To Send. An active low informs the modem or data set that the controller is ready to send data. During power-on reset, this pin is pulled up internally and is defined as HPRTAS1. It is used for setting the address of the parallel port. (See Table 1-3.) RTSB HURBS0 45 I/O UART B Request To Send. An active low informs the modem or data set that the controller is ready to send data. During power-on reset, this pin is pulled down internally and is defined as HURBS0. It is used for setting the I/O address of UART B. (See Table 1-2.) 1.3 Game Port/Power Down Interface Bit 4 of CR3 (GMODS0) determines whether the game port is in Adapter mode or Portable mode (default is Adapter mode). Game I/O port address is 201h. SYMBOL PIN I/O FUNCTION GMRD PFDCEN HEFERE 41 O O I Adapter mode: Game port read control signal. Portable mode: When parallel port is selected as Extension FDD/Extension 2FDD mode, this pin will be active. The active state is dependent on bit 7 of CRA (PFDCACT), and default is low active. During power-on reset, this pin is pulled up internally and is defined as HEFERE for determining whether Extended Function Enable Register enable value is 88h or 89h. If the HEFERE= H (default) at power-on reset, then EFER enable value is 89h. If HEFERE = L at power-on reset, the enable value is 88h. GMWR PEXTEN HPRTM0 39 O O I Adapter mode: Game port write control signal. Portable mode: When a particular extended mode is selected for the parallel port, this pin will be active. The extended modes include Extension Adapter mode, EPP mode, ECP mode, and ECP/EPP mode, which are selected using bit 3 - bit 0 of CRA. The active state is dependent on bit 6 of CRA (PEXTACT); the default is low active. During power-on reset, this pin is pulled down internally and is defined as HPRTM0. It is used to determine the mode of the parallel port. (See Table 1-1.) |
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