IMP16C552-CJ68 IMP Inc, IMP16C552-CJ68 Datasheet - Page 29

• Manufacturer Part Number: IMP16C552-CJ68
• Description: Dual Universal Asynchronous Receiver/Transmitter (UART) with 16-BYTE FIFO & Parallel Printer Port
• Manufacturer: IMP Inc

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LSI INTERRUPT
TRIGGER LEVEL
(FCR6,7=0,0)
(read LSR)
SAMPLE CLK
INTERRUPT
(read RBR)
LEVLINTERRUPT
IOR*
IOW*
LSI INTERRUPT
FIFO TRIGGER
SAMPLE CLK
OR TIMEOUT
(read LSR)
(read RBR)
SERIAL IN
IOW*
IOR*
SIN
(SIN)
FIGURE 11 – RCVR FIFO Timing after First Byte(RDR already set)
FIGURE 10 – RCVR FIFO Timing for First Byte
DATA(5-8)
DATA(5-8)
408-432-9100/www.impweb.com
PARITY
PARITY
from FIFO
previous
byte read
t
ACTIVE
SINT
t
SINT
STOP
STOP
START
START
top byte of FIFO
ACTIVE
t
SINT
t
RINT
ACTIVE
IMP16C552
IMP16C552
ACTIVE
t
RINT
FIFO at or above trigger level
ACTIVE
t
RINT
t
RINT
FIFO below
trigger levle
FIFO below
trigger level
© 2002 IMP, Inc.