参数资料
型号: XR68C681CP
厂商: Exar Corporation
文件页数: 24/75页
文件大小: 0K
描述: IC UART CMOS DUAL 40PDIP
产品变化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
标准包装: 9
特点: *
通道数: 2,DUART
FIFO's: 1 字节,3 字节
电源电压: 5V
安装类型: 通孔
封装/外壳: 40-DIP(0.600",15.24mm)
供应商设备封装: 40-PDIP
包装: 管件
XR68C681
1
,% Table 6 '% + % %'(+&
+(- %4
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M@N (% * + !((& ' -(%" $
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!!!!!!! " ( $ % '"
%'(&
(Note: the b suffix denotes a binary expression. x = don’t care
value).
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2' %( $ '(" (( %
!$ ( ' % '$ & ((-
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- (% (+( ' +$ ( Table 1
Table 10
%(G% % '$%" $ ( ++'
!$ (%
Register
Contents
Resulting Action
$ -(% "
</
! *0 ' 2!$ *( 5 J
$ -(% "
/
! *0 ' 2!$ *( 5 J
$ -(% *" *
/
! *0 ' 2!$ *( 5 J
$ -(% *" *
*/
! *0 ' 2!$ *( 5 J
Table 10. Command Register Control Over the Extend Bit
Note: if the user programs either nibble of the Clock
Select Register (CSRn[7:4] or CSRn[3:0]) with values
ranging from 016 to C16, then the user is using the BRG as
a source for timing. However, these standard bit rates
(presented in Table 9) apply only if the X1/CLK pin is
driven with a 3.6864 MHz signal. If a signal with a different
frequency (fo) is applied to the X1/CLK pin, then the
DUART channel is running at the following baud rate:
Actual Baud Rate =
MTable Baud Rate ValueN fo
1/</= MHz
provided that fo is between 2.0 MHz and 4.0 MHz.
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%
1X vs 16X Clock Signals
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- (% ! +" ( (% ( $(%'%%
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' ((- %' + ((- ' '3 #+ (%
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