參數(shù)資料
型號： SC16C752IB48,157
廠商： NXP Semiconductors
文件頁數(shù)： 2/47頁
文件大?。?/td> 0K
描述： IC DUAL UART 64BYTE 48LQFP
標(biāo)準(zhǔn)包裝： 1,250
通道數(shù)： 2，DUART
FIFO's： 64 字節(jié)
電源電壓： 2.5V，3.3V，5V
帶自動流量控制功能： 是
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 托盤
其它名稱： 935270055157
SC16C752IB48
SC16C752IB48-ND
Philips Semiconductors
SC16C752
Dual UART with 64-byte FIFO
Product data
Rev. 04 — 20 June 2003
10 of 47
9397 750 11635
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.3.2
TX
Xoff1/2 character is transmitted when the RX FIFO has passed the HALT trigger level
programmed in TCR[3:0].
Xon1/2 character is transmitted when the RX FIFO reaches the RESUME trigger
level programmed in TCR[7:4].
The transmission of Xoff/Xon(s) follows the exact same protocol as transmission of
an ordinary byte from the FIFO. This means that even if the word length is set to be 5,
6, or 7 characters, then the 5, 6, or 7 least signicant bits of Xoff1,2/Xon1,2 will be
transmitted. (Note that the transmission of 5, 6, or 7 bits of a character is seldom
done, but this functionality is included to maintain compatibility with earlier designs.)
It is assumed that software ow control and hardware ow control will never be
enabled simultaneously. Figure 6 shows an example of software ow control.
6.3.3
Software ow control example
Assumptions: UART1 is transmitting a large text le to UART2. Both UARTs are
using software ow control with single character Xoff (0F) and Xon (0D) tokens. Both
have Xoff threshold (TCR[3:0] = F) set to 60, and Xon threshold (TCR[7:4] = 8) set to
32. Both have the interrupt receive threshold (TLR[7:4] = D) set to 52.
UART 1 begins transmission and sends 52 characters, at which point UART2 will
generate an interrupt to its processor to service the RCV FIFO, but assume the
interrupt latency is fairly long. UART1 will continue sending characters until a total of
Fig 6.
Software ow control example.
TRANSMIT FIFO
PARALLEL-TO-SERIAL
SERIAL-TO-PARALLEL
Xon-1 WORD
Xon-2 WORD
Xoff-1 WORD
Xoff-2 WORD
RECEIVE FIFO
PARALLEL-TO-SERIAL
SERIAL-TO-PARALLEL
Xon-1 WORD
Xon-2 WORD
Xoff-1 WORD
Xoff-2 WORD
UART2
UART1
002aaa229
DATA
Xoff–Xon–Xoff
COMPARE
PROGRAMMED
Xon-Xoff
CHARACTERS
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SC16C754BIA68,512 功能描述:UART 接口集成電路 16CB 2.5V-5V 4CH 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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