SC16C752B datasheet(15/47 Pages) PHILIPS

tên linh kiện	SC16C752B

Giải thích chi tiết về linh kiện	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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nhà sản xuất	PHILIPS [NXP Semiconductors]

Trang chủ	http://www.nxp.com

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15 / 47 page

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

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.

wrptr

FIFO EMPTY

TXRDY

rdptr

FIFO EMPTY

RXRDY

002aaa232

at least one

location filled

at least one

location filled

TXRDY

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