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SC16C752B Datasheet(PDF) 15 Page - NXP Semiconductors

Part # SC16C752B
Description  5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
PDF  47 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SC16C752B Datasheet(HTML) 15 Page - NXP Semiconductors

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Philips Semiconductors
SC16C752B
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
Product data
Rev. 03 — 14 December 2004
15 of 47
9397 750 14443
© Koninklijke Philips Electronics N.V. 2004. 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
wrptr
FIFO EMPTY
TXRDY
RX
rdptr
rdptr
FIFO EMPTY
RXRDY
RXRDY
002aaa232
at least one
location filled
at least one
location filled
TXRDY



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