參數(shù)資料
型號(hào)： XR16C854CV
廠商： EXAR CORP
元件分類： 微控制器/微處理器
英文描述： QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
中文描述： 4 CHANNEL(S), 2M bps, SERIAL COMM CONTROLLER, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-64
文件頁(yè)數(shù)： 19/51頁(yè)
文件大?。?/td> 476K
代理商： XR16C854CV
XR16C854
19
Rev. 1.00P
Single baud rate generator is provided for the
transmitter and receiver, allowing independent TX/
RX channel control. The programmable Baud Rate
Generator is capable of accepting an input clock up
to 24 MHz, as required for supporting a 1.5Mbps
data rate. The 854 can be configured for internal or
external clock operation. For internal clock oscilla-
tor operation, an industry standard microprocessor
crystal (parallel resonant/ 22-33 pF load) is con-
nected externally between the XTAL1 and XTAL2
pins (see figure ). Alternatively, an external clock
can be connected to the XTAL1 pin to clock the
internal baud rate generator 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 854 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 initializa-
tion, the 854 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 5
and Figure 11). 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 5 below, shows the two selectable baud rate
tables available when using a 7.3728 MHz crystal.
Table 5, 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
XR16C854CV-0A-EVB 功能描述:UART 接口集成電路 Supports C854 64 ld TQFP, 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
XR16C854CV-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
XR16C854CVTR-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
XR16C854D 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
XR16C854DCV 制造商:Exar Corporation 功能描述:
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