參數(shù)資料
型號(hào)： 935270056512
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 4 CHANNEL(S), 5M bps, SERIAL COMM CONTROLLER, PQCC68
封裝： PLASTIC, MS-018, SOT-188-2, LCC-68
文件頁(yè)數(shù)： 8/52頁(yè)
文件大?。?/td> 680K
代理商： 935270056512
Philips Semiconductors
SC16C754
Quad UART with 64-byte FIFO
Product data
Rev. 02 — 14 March 2003
16 of 49
9397 750 11192
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.6 DMA operation
There are two modes of DMA operation, DMA mode 0 or DMA mode 1, selected by
FCR[3].
In DMA mode 0 or FIFO disable (FCR[0] = 0) DMA occurs in single character
transfers. In DMA mode 1, multi-character (or block) DMA transfers are managed to
relieve the processor for longer periods of time.
6.6.1
Single DMA transfers (DMA mode 0/FIFO disable)
Figure 10 shows TXRDY and RXRDY in DMA mode 0/FIFO disable.
Transmitter: When empty, the TXRDY signal becomes active. TXRDY will go inactive
after one character has been loaded into it.
Receiver: RXRDY is active when there is at least one character in the FIFO. It
becomes inactive when the receiver is empty.
Fig 10. TXRDY and RXRDY in DMA mode 0/FIFO disable.
TX
wrptr
FIFO EMPTY
TXRDY
AT LEAST ONE
LOCATION FILLED
TXRDY
RX
rdptr
FIFO EMPTY
RXRDY
AT LEAST ONE
LOCATION FILLED
RXRDY
002aaa232
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