参数资料
型号: SC16C752IB48,151
厂商: NXP Semiconductors
文件页数: 2/47页
文件大小: 0K
描述: IC UART DUAL W/FIFO 48-LQFP
标准包装: 250
通道数: 2,DUART
FIFO's: 64 字节
电源电压: 2.5V,3.3V,5V
带自动流量控制功能:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 托盘
其它名称: 568-3289
935270055151
SC16C752IB48-S
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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