参数资料
型号: XR17V252IM-F
厂商: Exar Corporation
文件页数: 17/69页
文件大小: 0K
描述: IC UART PCI BUS DUAL 100TQFP
标准包装: 90
特点: *
通道数: 2,DUART
FIFO's: 64 字节
规程: RS485
电源电压: 3.3V,5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 100-TQFP
供应商设备封装: 100-TQFP(14x14)
包装: 托盘
XR17V252
24
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.2
MPIOSEL [7:0] (default 0xFF)
Multipurpose input/output pin select. This register defines the functions of the pins. A logic 1 (default) defines
the pin for input and a logic 0 for output.
2.0
CRYSTAL OSCILLATOR / BUFFER
The V252 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 2 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 28 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 2 baud rate
generators for standard or custom rates. Typically, the oscillator connections are shown in Figure 10. For
further reading on oscillator circuit please see application note DAN108 on EXAR’s web site.
FIGURE 10. TYPICAL CRYSTAL CONNECTIONS
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
C1
22-47pF
C2
22-47pF
14.7456
MHz
XTAL1
XTAL2
R=300K to 400K
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