參數(shù)資料
型號： SC16C752IB48,157
廠商： NXP Semiconductors
文件頁數(shù)： 7/47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
15 of 47
9397 750 11635
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.6.2
Block DMA transfers (DMA mode 1)
Figure 10 shows TXRDY and RXRDY in DMA mode 1.
Transmitter: TXRDY is active when there is a trigger level number of spaces
available. It becomes inactive when the FIFO is full.
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 SC16C752 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 DLH, 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 DLH.
Fig 10. TXRDY and RXRDY in DMA mode 1.
TX
wrptr
TXRDY
FIFO FULL
TXRDY
RX
rdptr
FIFO EMPTY
RXRDY
AT LEAST ONE
LOCATION FILLED
RXRDY
002aaa234
TRIGGER
LEVEL
TRIGGER
LEVEL
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