参数资料
型号: SC16C754BIA68,518
厂商: NXP Semiconductors
文件页数: 10/50页
文件大小: 0K
描述: IC UART QUAD W/FIFO 68-PLCC
产品培训模块: Stand-Alone UARTs
标准包装: 1
通道数: 4,QUART
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: 68-LCC(J 形引线)
供应商设备封装: 68-PLCC
包装: 标准包装
产品目录页面: 828 (CN2011-ZH PDF)
其它名称: 568-2050-6
SC16C754B_4
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 6 October 2008
18 of 51
NXP Semiconductors
SC16C754B
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
6.6.2 Block DMA transfers (DMA mode 1)
Figure 12 shows TXRDY and RXRDY in DMA mode 1.
6.6.2.1
Transmitter
TXRDY is active when there is a trigger level number of spaces available. It becomes
inactive when the FIFO is full.
6.6.2.2
Receiver
RXRDY becomes active when the trigger level has been reached, or when a time-out
interrupt occurs. It will go inactive when the FIFO is empty or an error in the RX FIFO is
agged by LSR[7].
6.7 Sleep mode
Sleep mode is an enhanced feature of the SC16C754B UART. It is enabled when EFR[4],
the enhanced functions bit, is set and when IER[4] is set. Sleep mode is entered when:
The serial data input line, RX, is idle (see Section 6.8 “Break and time-out
The TX FIFO and TX shift register are empty.
There are no interrupts pending except THR and time-out interrupts.
Remark: Sleep mode will not be entered if there is data in the RX FIFO.
In Sleep mode, the UART clock and baud rate clock are stopped. Since most registers are
clocked using these clocks, the power consumption is greatly reduced. The UART will
wake up when any change is detected on the RX line, when there is any change in the
state of the modem input pins, or if data is written to the TX FIFO.
Remark: Writing to the divisor latches, DLL and DLM, to set the baud clock, must not be
done during Sleep mode. Therefore, it is advisable to disable Sleep mode using IER[4]
before writing to DLL or DLM.
Fig 12. TXRDY and RXRDY in DMA mode 1
TX
wrptr
TXRDY
FIFO full
TXRDY
RX
rdptr
FIFO EMPTY
RXRDY
002aaa869
trigger
level
trigger
level
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