TL16C552 datasheet(13/33 Pages) TI1

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TL16C552

DUAL ASYCHRONOUS COMMUNICATIONS ELEMENT

WITH FIFO

SLLS102B − DECEMBER 1990 − REVISED MARCH 1996

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

PARAMETER MEASUREMENT INFORMATION

Active

Top Byte of FIFO

IOR

(RD LSR)

CLK

Sample

SIN

Active

Time Out or

Trigger Level

Interrupt

LSI

Interrupt

IOR

(RD RBR)

(FIFO at or above

trigger level)

(FIFO below

trigger level)

Previous Byte

Read From FIFO

Stop

td9

(see Note A)

tpd6

td9

tpd6

50 %

Figure 11. Receiver FIFO After First Byte (After RDR Set) Waveforms

Active

IOR

(RD RBR)

CLK

Sample

SIN

(first byte)

Stop

td9

(see Note B )

RXRDY

tpd7

See Note A

50 %

Figure 12. Receiver Ready Mode 0 Waveforms

NOTES: A. This is the reading of the last byte in the FIFO.

B. When FCR0=1, then td9 = 3 RCLK cycles. For a time-out interrupt, td9 = 8 RCLK cycles.

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