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参数资料
| 型号： | XR16M2752IJ-0A-EB |
| 厂商： | Exar Corporation |
| 文件页数： | 2/51页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR M2752-A 44PLCC |
| 标准包装： | 1 |
| 系列： | * |
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XR16M2752
10
1.62V TO 3.63V HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
REV. 1.0.0
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 100 ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see Figure 4). The programmable Baud
Rate Generator is capable of operating with a crystal oscillator frequency of up to 24 MHz. However, with an
external clock input on XTAL1 pin, it can extend its operation up to 64 MHz (8 Mbps serial data rate) at 3.3V
with an 8X sampling rate. For further reading on the oscillator circuit please see the Application Note DAN108
on the EXAR web site at http://www.exar.com.
2.9
Programmable Baud Rate Generator with Fractional Divisor
Each UART has its own Baud Rate Generator (BRG) with a prescaler for the transmitter and receiver. The
prescaler is controlled by a software bit in the MCR register. The MCR register bit-7 sets the prescaler to divide
the input crystal or external clock by 1 or 4. The output of the prescaler clocks to the BRG. The BRG further
divides this clock by a programmable divisor between 1 and (216 - 0.0625) in increments of 0.0625 (1/16) to
obtain a 16X or 8X sampling clock of the serial data rate. The sampling clock is used by the transmitter for data
bit shifting and receiver for data sampling. The BRG divisor (DLL, DLM and DLD registers) defaults to the value
of ’1’ (DLL = 0x01, DLM = 0x00 and DLD = 0x00) upon reset. Therefore, the BRG must be programmed during
initialization to the operating data rate. The DLL and DLM registers provide the integer part of the divisor and
the DLD register provides the fractional part of the dvisior. Only the four lower bits of the DLD are implemented
and they are used to select a value from 0 (for setting 0000) to 0.9375 or 15/16 (for setting 1111). Programming
the Baud Rate Generator Registers DLL, DLM and DLD provides the capability for selecting the operating data
rate. Table 5 shows the standard data rates available with a 24MHz crystal or external clock at 16X clock rate.
If the pre-scaler is used (MCR bit-7 = 1), the output data rate will be 4 times less than that shown in Table 5. At
8X sampling rate, these data rates would double. Also, when using 8X sampling mode, please note that the bit-
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):
The closest divisor that is obtainable in the M2752 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.
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)
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相关代理商/技术参数 |
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| XR16M2752IJ-0B-EB | 功能描述:界面开发工具 Eval Board for XR16M2752IJ Series RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR16M2752IJ44 | 制造商:EXAR 制造商全称:EXAR 功能描述:1.62V TO 3.63V HIGH PERFORMANCE DUART WITH 64-BYTE FIFO |
| XR16M2752IJ44-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR16M2752IL-0A-EB | 功能描述:界面开发工具 Eval Board for XR16M2752IL-0A RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR16M2752IL-0B-EB | 功能描述:界面开发工具 Eval Board for XR16M2752IL Series RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
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