sc16c752-04 NXP Semiconductors, sc16c752-04 Datasheet - Page 14

• Manufacturer Part Number: sc16c752-04
• Description: Sc16c752 Dual Uart With 64-byte Fifo
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 11635
Product data
6.6.1 Single DMA transfers (DMA mode 0/FIFO disable)
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.
Figure 9
Transmitter:
after one character has been loaded into it.
Receiver:
becomes inactive when the receiver is empty.
Fig 9. TXRDY and RXRDY in DMA mode 0/FIFO disable.
wrptr
wrptr
shows TXRDY and RXRDY in DMA mode 0/FIFO disable.
RXRDY is active when there is at least one character in the FIFO. It
When empty, the TXRDY signal becomes active. TXRDY will go inactive
FIFO EMPTY
TX
Rev. 04 — 20 June 2003
AT LEAST ONE
LOCATION FILLED
TXRDY
TXRDY
rdptr
rdptr
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Dual UART with 64-byte FIFO
FIFO EMPTY
RX
SC16C752
AT LEAST ONE
LOCATION FILLED
RXRDY
RXRDY
002aaa232
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