SC16C752BIBS Philips Semiconductors, SC16C752BIBS Datasheet - Page 15

• Manufacturer Part Number: SC16C752BIBS
• Description: 5 V/ 3.3 V and 2.5 V dual UART/ 5 Mbit/s (max.)/ with 64-byte FIFOs
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 14443
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 10
Transmitter:
after one character has been loaded into it.
Receiver:
becomes inactive when the receiver is empty.
Fig 10. 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
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
Rev. 03 — 14 December 2004
TX
TXRDY
TXRDY
location filled
at least one
rdptr
rdptr
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
FIFO EMPTY
SC16C752B
RX
RXRDY
location filled
RXRDY
at least one
002aaa232
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