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Theory of Operation 4-21
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Parallel Port
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Enhanced Parallel Port(EPP) compatible
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Extended Capabilities Port(ECP) compatible, including level 2 support
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Bidirectional under either software or hardware control
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Compatible with ISA, and EISA, architectures
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Ability to multiplex FDC signals on parallel port pins allows use of an external Floppy Disk
Drive(FDD)
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Includes protection circuit to prevent damage to the parallel port when a connected printer is
powered up or is operated at a higher voltage
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The UARTs:
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Software compatible with the PC16550A and PC16450
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MIDI baud rate support
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Infrared support on UART2(IrDA and Sharp-compliant)
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The Address Decoder
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6 bit or 10 bit decoding
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External Chip Select capability when 10 bit decoding
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Full relocation capability(No limitation)
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Enhanced Power Management
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Special configuration registers for power-down
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Enhanced programmable power-down FDC command
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Auto power-down and wake-up modes
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2 special pins for power management
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Typical current consumption during power-down is less than 10 uA
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Reduced pin leakage current
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Mixed Voltage support
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Supports standard 5V operation
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Supports 3.3V operation
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Supports mixed internal 3.3V operation with 3.3V/5V external configuration
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The General Purpose Pins:
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2 pins The Bidirectional Parallel Port:, for 2 separate programmable chip select decoders, can
be programmed for game port control