參數(shù)資料
型號(hào): XR19L202IL48-0B-EB
廠商: Exar Corporation
文件頁數(shù): 3/50頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XR19L202 48QFN
標(biāo)準(zhǔn)包裝: 1
系列: *
XR19L202
11
REV. 1.0.1
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
The closest divisor that is obtainable in the L202 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.
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)
FIGURE 5. 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
To Other
Channel
Fractional Baud
Rate Generator
Logic
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