參數(shù)資料
型號： XR16C854IJTR-F
廠商： Exar Corporation
文件頁數(shù)： 6/53頁
文件大?。?/td> 0K
描述： IC UART FIFO 128B QUAD 68PLCC
標準包裝： 250
特點： *
通道數(shù)： 4，QUART
FIFO's： 128 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 2.97 V ~ 5.5 V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調制解調器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 68-LCC（J 形引線）
供應商設備封裝： 68-PLCC
包裝： 帶卷 (TR)
XR16C854/854D
14
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 3.1.0
2.11
Transmitter
The transmitter section comprises of an 8-bit Transmit Shift Register (TSR) and 128 bytes of FIFO which
includes a byte-wide Transmit Holding Register (THR). TSR shifts out every data bit with the 16X internal
clock. A bit time is 16 clock periods. The transmitter sends the start-bit followed by the number of data bits,
inserts the proper parity-bit if enabled, and adds the stop-bit(s). The status of the TX FIFO and TSR are
reported in the Line Status Register (LSR bit-5 and bit-6).
2.11.1
Transmit Holding Register (THR) - Write Only
The transmit holding register is an 8-bit register providing a data interface to the host processor. The host
writes transmit data byte to the THR to be converted into a serial data stream including start-bit, data bits,
parity-bit and stop-bit(s). The least-significant-bit (Bit-0) becomes first data bit to go out. The THR is the input
register to the transmit FIFO of 128 bytes when FIFO operation is enabled by FCR bit-0. Every time a write
operation is made to the THR, the FIFO data pointer is automatically bumped to the next sequential data
location.
2.11.2
Transmitter Operation in non-FIFO Mode
The host loads transmit data to THR one character at a time. The THR empty flag (LSR bit-5) is set when the
data byte is transferred to TSR. THR flag can generate a transmit empty interrupt (ISR bit-1) when it is enabled
by IER bit-1. The TSR flag (LSR bit-6) is set when TSR becomes completely empty.
FIGURE 6. BAUD RATE GENERATOR AND PRESCALER
TABLE 6: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK
OUTPUT Data Rate
MCR Bit-7=1
OUTPUT Data Rate
MCR Bit-7=0
(DEFAULT)
DIVISOR FOR 16x
Clock (Decimal)
DIVISOR FOR 16x
Clock (HEX)
DLM
PROGRAM
VALUE (HEX)
DLL
PROGRAM
VALUE (HEX)
DATA RATE
ERROR (%)
100
600
1200
2400
4800
9600
19.2k
38.4k
57.6k
115.2k
230.4k
400
2400
4800
9600
19.2k
38.4k
76.8k
153.6k
230.4k
460.8k
921.6k
2304
384
192
96
48
24
12
6
4
2
1
900
180
C0
60
30
18
0C
06
04
02
01
09
01
00
80
C0
60
30
18
0C
06
04
02
01
0
X T A L 1
X T A L 2
C ry s ta l
O s c /
B u ffe r
M C R B it-7 = 0
(d e fa u lt)
M C R B it-7 = 1
D L L a n d D L M
R e g iste rs
P re s c a le r
D iv id e b y 1
P re s c a le r
D iv id e b y 4
1 6 X
S a m p lin g
R a te C lo c k to
T ra n s m itte r
B a u d R a te
G e n e ra to r
L o g ic
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相關代理商/技術參數(shù)
參數(shù)描述
XR16C854IQ 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Exar Corporation 功能描述:
XR16C854IQ-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
XR16C854IQTR-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
XR16C854IV 制造商:Exar Corporation 功能描述:
XR16C854IV-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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