參數(shù)資料
型號(hào)： XR16C864
廠商： Exar Corporation
元件分類： 通用總線功能
英文描述： Quad UART with RX/TX FIFO Counters and 128-byte FIFO(四通用異步接收器/發(fā)送器（帶RX/TX 先進(jìn)先出計(jì)數(shù)器和128字節(jié)先進(jìn)先出）)
中文描述： 四路與異步接收/發(fā)送FIFO的計(jì)數(shù)器和128字節(jié)的FIFO（四通用異步接收器/發(fā)送器（帶了Rx / Tx先進(jìn)先出計(jì)數(shù)器和128字節(jié)先進(jìn)先出））
文件頁(yè)數(shù)： 17/46頁(yè)
文件大?。?/td> 381K
代理商： XR16C864
XR16C864
17
Rev. 1.10
The programmable Baud Rate Generator is capable
of accepting an input clock up to 24 MHz, as re-
quired for supporting a 1.5Mbps data rate. The 864
can be configured for internal or external clock
operation. For internal clock oscillator operation, an
industry standard microprocessor crystal (parallel
resonant/ 22-33 pF load) is connected externally
between the XTAL1 and XTAL2 pins (see figure 4).
Alternatively, an external clock can be connected to
the XTAL1 pin to clock the internal baud rate genera-
tor for standard or custom rates. (see Baud Rate
Generator Programming).
The generator divides the input 16X clock by any
divisor from 1 to 2
16
-1. The 864 divides the basic
crystal or external clock by 16. Further division of this
16X clock provides two table rates to support low and
high data rate applications using the same system
design. After a hardware reset and during initialization,
the 864 sets the default baud rate table according to the
state of the CLKSEL. pin. A logic 1 on CLKSEL will set
the 1X clock default whereas, logic 0 will set the 4X
clock default table. Following the default clock rate
selection during initialization, the rate tables can be
changed by the internal register, MCR bit-7. Setting
MCR bit-7 to a logic 1 when CLKSEL is a logic 1
provides an additional divide by 4 whereas, setting
MCR bit-7 to a logic 0 only divides by 1. (See Table 4 and
Figure 5). Customized Baud Rates can be achieved by
selecting the proper divisor values for the MSB and LSB
sections of baud rate generator.
Programming the Baud Rate Generator Registers
DLM (MSB) and DLL (LSB) provides a user capability
for selecting the desired final baud rate. The example
in Table 4 below, shows the two selectable baud rate
tables available when using a 7.3728 MHz crystal.
Table 4, BAUD RATE GENERATOR PROGRAMMING TABLE (7.3728 MHz CLOCK):
Output
Baud Rate
MCR
BIT-7=1
Output
Baud Rate
MCR
Bit-7=0
User
User
DLM
Program
Value
(HEX)
DLL
16 x Clock
Divisor
(Decimal)
16 x Clock
Divisor
(HEX)
Program
Value
(HEX)
50
300
600
1200
2400
4800
9600
19.2k
38.4k
57.6k
115.2k
200
1200
2400
4800
9600
19.2K
38.4k
76.8k
153.6k
230.4k
460.8k
2304
384
192
96
48
24
12
6
3
2
1
900
180
C0
60
30
18
0C
06
03
02
01
09
01
00
00
00
00
00
00
00
00
00
00
80
C0
60
30
18
0C
06
03
02
01
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16C864CQ 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
XR16C864CQ-0A-EVB 功能描述:UART 接口集成電路 Supports C864 100 ld QFP, ISA Interface 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
XR16C864CQ-0B-EB 功能描述:界面開(kāi)發(fā)工具 Eval Board for XR16C864CQ Series RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
XR16C864CQ-F 功能描述:UART 接口集成電路 UART 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
XR16C864CQTR-F 功能描述:UART 接口集成電路 UART 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
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