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SC16C752 Datasheet(PDF) 14 Page - NXP Semiconductors

Part # SC16C752
Description  Dual UART with 64-byte FIFO
PDF  47 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SC16C752 Datasheet(HTML) 14 Page - NXP Semiconductors

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Philips Semiconductors
SC16C752
Dual UART with 64-byte FIFO
Product data
Rev. 04 — 20 June 2003
14 of 47
9397 750 11635
© 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 9 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 9.
TXRDY and RXRDY in DMA mode 0/FIFO disable.
TX
wrptr
wrptr
FIFO EMPTY
TXRDY
AT LEAST ONE
LOCATION FILLED
TXRDY
RX
rdptr
rdptr
FIFO EMPTY
RXRDY
AT LEAST ONE
LOCATION FILLED
RXRDY
002aaa232



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