XR17D158 Exar Corporation, XR17D158 Datasheet - Page 23

• Manufacturer Part Number: XR17D158
• Description: Eight-channel Pci-bus Uart
• Manufacturer: Exar Corporation

XR17D158
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
REV. P1.0.0
MPIOLVL [7:0] (default 0x00)
Output pin level control and input level status. The status of the input pin(s) is read on this register and output
pins are controlled on this register. A logic 0 (default) sets the output to low and a logic 1 sets the output pin to
high. The MPIO interrupt will clear upon reading this register.
MPIO3T [7:0] (default 0x00)
Output pin tri-state control. A logic 0 (default) sets the output to active level per register MPIOBIT settling, a
logic 1 sets the output pin to tri-state.
MPIOINV [7:0] (default 0x00)
Input inversion control. A logic 0 (default) does not invert the input pin logic. A logic 1 inverts the input logic
level.
B it-7 B it-6 B it-5 B it-4 B it-3 B it-2 B it-1 B it-0
M P IO 7
B it-7 B it-6 B it-5 B it-4 B it-3 B it-2 B it-1 B it-0
M P IO 7
B it-7 B it-6 B it-5 B it-4 B it-3 B it-2 B it-1 B it-0
M P IO 7
B it-7 B it-6 B it-5 B it-4 B it-3 B it-2 B it-1 B it-0
M P IO 7
M ultipurpose Input S ignal Inversion E nable
M ultipurpose Input/O utput Interrupt E nable
M P IO 6
M P IO 6
M P IO 6
M P IO 6
M ultipurpose O utput Level C ontrol
M ultipurpose O utput 3-state E n able
M P IO 5 M P IO 4 M P IO 3 M P IO 2 M P IO 1 M P IO 0
M P IO 5 M P IO 4 M P IO 3 M P IO 2 M P IO 1 M P IO 0
M P IO 5 M P IO 4 M P IO 3 M P IO 2 M P IO 1 M P IO 0
M P IO 5 M P IO 4 M P IO 3 M P IO 2 M P IO 1 M P IO 0
M P IO LVL Register
M PIO INV Register
M PIO INT Register
M PIO 3T Register
23
PRELIMINARY
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