xr17c152im Exar Corporation, xr17c152im Datasheet - Page 18

• Manufacturer Part Number: xr17c152im
• Description: 5v Pci Bus Dual Uart
• Manufacturer: Exar Corporation

XR17C152
5V PCI BUS DUAL UART
MPIOINT [7:0] (default 0x00)
Enable multipurpose input pin interrupt. If the pin is selected by MPIOSEL as input then bit-0 enables input pin
0 for interrupt, and bit-7 enables input pin 7. No interrupt is enabled if the pin is selected to be an output. The
interrupt is edge sensing and determined by MPIOINV and MPIOLVL registers. The MPIO interrupt clears after
a read to register MPIOLVL. The combination of MPIOLVL and MPIOINV determines the interrupt being active
low or active high, it’s level trigger. Logic 0 (default) disables the pin’s interrupt and logic 1 enables it.
F
IGURE
MPIOINT [7:0]
MPIOLVL [7:0]
Read Input Level
MPIOINV [7:0]
(Input Inversion Enable =1)
MPIOLVL [7:0]
(Output Level)
MPIO3T [7:0]
(3-state Enable =1)
MPIOSEL [7:0]
(Select Input=1, Output=0 )
INT
6. M
AND
ULTIPURPOSE INPUT
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 ultipu rpo se Inp ut/O u tpu t In terrup t E n ab le
M P IO 6
M P IO 5 M P IO 4 M P IO 3 M P IO 2 M P IO 1 M P IO 0
Rising Edge
Detection
M PIO IN T R egister
OR
/
OUTPUT INTERNAL CIRCUIT
1
0
18
AND
Pin [7:0]
MPIO
MPIOCKT
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REV. 1.2.0