參數(shù)資料
型號(hào)： XR16V794IV-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 51/53頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 64B QUAD 64LQFP
標(biāo)準(zhǔn)包裝： 160
特點(diǎn)： *
通道數(shù)： 4，QUART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 2.25 V ~ 3.6 V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
安裝類(lèi)型： 表面貼裝
封裝/外殼： 64-LQFP
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
包裝： 托盤(pán)
XR16V794
7
REV. 1.0.1
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
2.4
INT# Ouput
The INT# interrupt output changes according to the operating mode and enhanced features setup. Table 2
and 3 summarize the operating behavior for the transmitter and receiver.
2.5
CRYSTAL OSCILLATOR / BUFFER
The 794 includes an on-chip oscillator. The crystal oscillator provides the system clock to the Baud Rate
Generators (BRG) in each of the 4 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. For programming
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 (see Figure 3). Alternatively, an external
clock can be connected to the XTAL1 pin to clock the internal 4 baud rate generators for standard or custom
rates. The typical oscillator connections are shown in Figure 3. For further reading on oscillator circuit please
see application note DAN108 on EXAR’s web site.
TABLE 2: INT# PIN OPERATION FOR TRANSMITTER
Auto RS485
Mode
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1
(FIFO ENABLED)
NO
HIGH = a byte in THR
LOW = THR empty
HIGH = FIFO above trigger level
LOW = FIFO below trigger level or FIFO empty
YES
HIGH = a byte in THR
LOW = transmitter empty
HIGH = FIFO above trigger level
LOW = FIFO below trigger level or transmitter empty
TABLE 3: INT# PIN OPERATION FOR RECEIVER
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1
(FIFO ENABLED)
HIGH = no data
LOW = 1 byte
HIGH = FIFO below trigger level
LOW = FIFO above trigger level
FIGURE 3. TYPICAL OSCILLATOR CONNECTIONS
C1
22-47pF
C2
22-47pF
24 MHz
XTAL1
XTAL2
R=300K to 400K
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