参数资料
型号: XR88C681J-F
厂商: Exar Corporation
文件页数: 51/101页
文件大小: 0K
描述: IC UART CMOS DUAL 44PLCC
标准包装: 27
特点: *
通道数: 2,DUART
FIFO's: 1 字节,3 字节
电源电压: 4.75 V ~ 5.25 V
带并行端口:
带CMOS:
安装类型: 表面贴装
封装/外壳: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 管件
其它名称: 1016-1329
XR88C681
53
Rev. 2.11
D.2 Bit Rate Generator
The BRG (Bit Rate Generator) accepts the timing output
of the Oscillator Circuit and generate the clock signal for
23 commonly used data communication bit rates ranging
from 50 bps up to 115.2kbps.
Please note that the BRG
will only generate these standard bit rates if the Oscillator
Circuit is running at 3.6864 MHz. Additionally, the actual
clock frequencies output from the BRG are at 16 times
these rates.
The user can select one of two different sets of bit rates, to
be generated from the BRG. This selection is made by
setting or clearing ACR[7]. A listing of these sets of Bit
Rates, from the BRG, is presented in the discussion of the
Clock Select Registers (CSRs) in
Section D.5. A block
diagram of the BRG circuitry is presented in
Figure 27.
Oscillator
Circuit
X1/CLK
X2
Bit Rate Generator
Channels A and B
ACR[7]
CSRB[3:0]
32:1 MUX
TXCB
CSRB[7:4]
32:1 MUX
RXCB
CSRA[7:4]
32:1 MUX
RXCA
CSRA[3:0]
32:1 MUX
TXCA
Figure 27. Block Diagram of the Bit Rate Generator portion of the Timing Control Block
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