參數(shù)資料
型號(hào): XR17V258IVTR-F
廠商: Exar Corporation
文件頁(yè)數(shù): 20/69頁(yè)
文件大?。?/td> 0K
描述: IC UART PCI BUS OCTAL 144LQFP
標(biāo)準(zhǔn)包裝: 750
特點(diǎn): *
通道數(shù): 8
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 3.3V,5V
帶自動(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應(yīng)商設(shè)備封裝: 144-LQFP(20x20)
包裝: 帶卷 (TR)
MPIO6
MPIO7
MPIO5 MPIO4 MPIO3 MPIO2 MPIO1 MPIO0
MPIOLVL Register
Multipurpose Output Level Control
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
XR17V258
27
REV. 1.0.2
66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
MPIO3T [7:0] (default 0x00)
The MPIO outputs can be tri-stated by the MPIO3T register. A logic 0 (default) sets the output to active level
per register MPIOBIT settling, a logic 1 sets the output pin to tri-state.
MPIO6
MPIO7
MPIO5 MPIO4 MPIO3 MPIO2 MPIO1 MPIO0
MPIO3T Register
Multipurpose Output 3-state Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
MPIOINV [7:0] (default 0x00)
The MPIO inputs can be inverted by the MPIOINV register. A logic 0 (default) does not invert the input pin logic.
A logic 1 inverts the input logic level.
MPIO6
MPIO7
MPIO5 MPIO4 MPIO3 MPIO2 MPIO1 MPIO0
MPIOINV Register
Multipurpose Input Signal Inversion Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
MPIOSEL [7:0] (default 0xFF)
The MPIOSEL register defines the MPIOs as either an input or output. A logic 1 (default) defines the pin for
input and a logic 0 for output.
MPIO6
MPIO7
MPIO5 MPIO4 MPIO3 MPIO2 MPIO1 MPIO0
MPIOSEL Register
Multipurpose Input/Output Selection
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
2.0 CRYSTAL OSCILLATOR / BUFFER
The V258 includes an on-chip oscillator (XTAL1 and XTAL2). The crystal oscillator provides the system clock
to the Baud Rate Generators (BRG) in each of the 8 UARTs, the 16-bit general purpose timer/counter and
internal logics. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the
output. See the Programmable Baud Rate Generator in the UART section on page 31 for programming details.
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant with
10-22 pF capacitance load, 100ppm) connected externally between the XTAL1 and XTAL2 pins (see
). Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal 8 baud rate
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