REV. 1.0.3 time will have a jitter (+/- 1/16) whenever the DLD is non-zero an" />
參數(shù)資料
型號(hào): XR19L400IL40TR-F
廠商: Exar Corporation
文件頁(yè)數(shù): 2/46頁(yè)
文件大小: 0K
描述: IC UART/TXRX RS485 40QFN
標(biāo)準(zhǔn)包裝: 3,000
特點(diǎn): *
通道數(shù): 1,UART
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:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 40-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 40-QFN 裸露焊盤(6x6)
包裝: 帶卷 (TR)
XR19L400
10
SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
REV. 1.0.3
time will have a jitter (+/- 1/16) whenever the DLD is non-zero and is an odd number. When using a non-
standard data rate crystal or external clock, the divisor value can be calculated with the following equation(s):
Required Divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16), with 16X mode EMSR[7] = 1
Required Divisor (decimal) = (XTAL1 clock frequency / prescaler / (serial data rate x 8), with 8X mode EMSR[7] = 0
ROUND( (Required Divisor - TRUNC(Required Divisor) )*16)/16 + TRUNC(Required Divisor), where
DLM = TRUNC(Required Divisor) >> 8
DLL = TRUNC(Required Divisor) & 0xFF
DLD = ROUND( (Required Divisor-TRUNC(Required Divisor) )*16)
The closest divisor that is obtainable in the L400 can be calculated using the following formula:
In the formulas above, please note that:
TRUNC (N) = Integer Part of N. For example, TRUNC (5.6) = 5.
ROUND (N) = N rounded towards the closest integer. For example, ROUND (7.3) = 7 and ROUND (9.9) = 10.
A >> B indicates right shifting the value ’A’ by ’B’ number of bits. For example, 0x78A3 >> 8 = 0x0078.
FIGURE 6. BAUD RATE GENERATOR
XTAL1
XTAL2
Crystal
Osc/
Buffer
MCR Bit-7=0
(default)
MCR Bit-7=1
DLL, DLM and DLD
Registers
Prescaler
Divide by 1
Prescaler
Divide by 4
16X or 8X
Sampling
Rate Clock
to Transmitter
and Receiver
Fractional Baud
Rate Generator
Logic
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