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參數(shù)資料
| 型號： | XR68M752IB-0A-EVB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 6/54頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR 68M752 49BGA |
| 標準包裝： | 1 |
| 系列： | * |
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XR16M752/XR68M752
14
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
REV. 1.1.1
When using 4X sampling mode, the bit time will have a jitter of ± 1/8 whenever DLD is non-zero, odd and not a
multiple of 4.
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, DLD[5:4]=’00’
Required Divisor (decimal)= (XTAL1 clock frequency / prescaler / (serial data rate x 8), with 8X mode, DLD[5:4] = ’01’
Required Divisor (decimal)= (XTAL1 clock frequency / prescaler / (serial data rate x 4), with 4X mode, DLD[5:4] = ’10’
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 M752 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 or 4X
Sampling
Rate Clock
to Transmitter
and Receiver
To Other
Channel
Fractional Baud
Rate Generator
Logic
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相關代理商/技術參數(shù) |
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|---|---|
| XR68M752IB-0B-EVB | 功能描述:界面開發(fā)工具 Eval Board for XR68M752IB Series RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XR68M752IB49 | 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 64-BYTE FIFO |
| XR68M752IB49-F | 功能描述:UART 接口集成電路 W/64 BYTE FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR68M752IL-0B-EB | 功能描述:界面開發(fā)工具 Support XR68M752 32L QFN, PCI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XR68M752IL32 | 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 64-BYTE FIFO |
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