參數(shù)資料
型號(hào): XR17D154
廠商: Exar Corporation
英文描述: UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
中文描述: 通用(3.3V和5V)PCI總線四的UART
文件頁(yè)數(shù): 14/69頁(yè)
文件大?。?/td> 836K
代理商: XR17D154
xr
XR17D154
REV. 1.2.0
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
21
2.2.10
MPIO REGISTER
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 outputs pins. Figure 8 shows the internal circuitry.
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 enable 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.
FIGURE 8. MULTIPURPOSE INPUT/OUTPUT INTERNAL CIRCUIT
MP IO
P in [7:0]
M P IO LV L [7:0]
R ea d Inp ut Le vel
M P IO IN T [7:0]
R ising E dge
Detection
IN T
OR
AN D
1
0
M P IO S E L [7:0]
(S elect Inp ut=1 , O u tp ut= 0 )
M P IO 3T [7:0]
(3-s ta te E n ab le =1 )
M P IO LV L [7:0]
(O utp ut Lev el)
M P IO IN V [7:0]
(Inp ut In vers io n E na ble =1 )
MP IO C K T
MPIO 6
MPIO 7
MPIO 5 MPIO 4 MPIO 3 MPIO 2 MPIO 1 MPIO 0
M P IO IN T R eg ister
M ultipu rpo se Inp ut/O u tpu t In terrup t E n ab le
B it-7 B it-6
B it-5
B it-4
B it-3
B it-2
B it-1 B it-0
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