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REV. 1.0.1 2.6 Crystal Oscillator or External Clock Input The " />

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參數(shù)資料

XR16M670

1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO

REV. 1.0.1

2.6

Crystal Oscillator or External Clock Input

The M670 includes an on-chip oscillator to produce a clock for the baud rate generators in the device when a

crystal is connected between XTAL1 and XTAL2 as show below. The CPU data bus does not require this clock

for bus operation. The crystal oscillator provides a system clock to the Baud Rate Generators (BRGs) in the

UART. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output. For

programming details, see “Section 2.7, Programmable Baud Rate Generator with Fractional Divisor” on

FIGURE 6. TYPICAL CRYSTAL CONNECTIONS

22-47pF

1.8432 MHz

24 MHz

0-120

(Optional)

500K - 1M

XTAL1

XTAL2

The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,

fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency

tolerance) connected externally between the XTAL1 and XTAL2 pins. Typical oscillator connections are shown

in Figure 6. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate

generator for standard or custom rates. The BGA package has XTAL1 only, the external clock is required. For

further reading on oscillator circuit, see application note DAN108 on EXAR’s web site.

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XR16M670IL32-0C-EB	功能描述:界面開(kāi)發(fā)工具 Eval Board for XR16M670IL32 Series RoHS:否制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
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