4-20 Theory of Operation
Extended Capabilitie Port (ECP) compatible, including level 2 support
Bidirectional under either software or hardware control
Compatible with ISA and EISA architectures
Ability to multiplex FDC signals on parallel port pins allows use of an external Floppy
Disk Drive (FDD)
Includes protection circuit to prevent damage to the parallel port when a connected
printer is powered up or is operated at a higher voltage
UARTs:
Software compatible with the PC16550A and PC16450
MIDI baud rate support
Infared support on UART2 (IrDA and Sharp-compliant)
Address Decoder
6-bit or 10-bit decoding
External Chip Select capability when 10-bit decoding
Full relocation capability (no limitation)
Enhanced Power Management
Special configuration registers for power-down
Enhanced programmable power-down FDC command
Auto power-down and wake-up modes
2 special pins for power management
Typical current consumption during power-down is less than 10 µA
Reduced pin leakage current
Mixed Voltage support
Supports standard 5V operation
Supports 3.3V operation
Supports mixed internal 3.3V operation with 3.3V/5V external configuration
General Purpose Pins:
2 pins the Bidirectional Parallel Port, for 2 separate programmable chip select
decoders, can be programmed for game port control
Plug and Play Compatible:
16 bit addressing (full programmable)
10 selectable IRQs
3 selectable DMA Channels
3 SIRQ Inputs allow external devices to mapping IRQs
100-pin TQFP package - PC87336VJG