TL16C552A, TL16C552AM

DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT

WITH FIFO

SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999

17

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

IOR

(RD_LPS)

Line Printer

Status Register,

Bit 2 (PRINT)

td13

td(int

(see Note A)

ACK

ENIRQ

INT2

td14

50%

50%

50%

50%

50%

50%

NOTE A: A timing value is not provided for td(int) in the tables because the line printer status register, bit 2 (PRINT) is an internal signal.

Figure 16. Parallel Port AT Mode Timing (ENIRQ = Low) Waveforms

IOR

(RD_LPS)

PRINT

td15

td16

ACK

ENIRQ

INT2

50%

50%

50%

50%

Figure 17. Parallel Port PS/2 Mode Timing (ENIRQ = High) Waveforms

RESET

tw3

50%

50%

Figure 18. RESET Voltage Waveform