xr17l152im Exar Corporation, xr17l152im Datasheet - Page 16

• Manufacturer Part Number: xr17l152im
• Description: 3.3v Pci Bus Dual Uart
• Manufacturer: Exar Corporation

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The L152 provides 8 multi-purpose inputs/outputs [MPIO7:0] for general use. Each pin can be programmed to
be an input or output function. The input logic state can be set for normal or inverted level, and optionally set to
generate an interrupt. The outputs can be set to be normal logic 1 or 0 state, or three-state. Their functions and
definitions are programmed through 5 registers: MPIOINT, MPIOLVL, MPIO3T, MPIOINV and MPIOSEL. If all 8
pins are set for inputs, all 8 interrupts would be or’ed together. The Or’ed interrupt is reported in the channel 0
UART interrupt status, see Interrupt Status Register. The pins may also be programmed to be outputs and to
the three-state condition for signal sharing.
Bit 7 represents MPIO7 pin and bit 0 represents MPIO0 pin. There are 5 registers that select, control and
monitor the 8 multipurpose inputs and output pins.
1.2.9
1.2.10
Multi-Purpose Inputs and Outputs
MPIO REGISTER
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
ULTIPURPOSE INPUT
AND
Rising Edge
Detection
Figure 6
OR
/
OUTPUT INTERNAL CIRCUIT
1
0
16
shows the internal circuitry.
AND
Pin [7:0]
MPIO
MPIOCKT
3.3V PCI BUS DUAL UART
XR17L152
REV. 1.1.0