Philips Semiconductors
Product specification
Enhanced octal universal asynchronous
receiver/transmitter (Octal UART)
SCC2698B
RDN
t
PS
t
PH
MPIx OR
MPPx
WRN
RDN
t
PD
t
PD
MPOx
OLD DATA
NEW DATA
SD00189
Figure 7. Port Timing
V
WRN
M
t
IR
V
+0.5V
1
OL
INTERRUPT
OUTPUT
V
OL
RDN
t
IR
V
+0.5V
1
OL
INTERRUPT
OUTPUT
V
OL
NOTES:
1. INCLUDES MPP WHEN USED AS TxRDY or RxDY/FFULL OUTPUTS AS WELL AS INTRN.
2. THE TEST FOR OPEN DRAIN OUTPUTS IS INTENDED TO GUARANTEE SWITCHING OF THE OUTPUT TRANSISTOR. MEASUREMENT OF THIS RESPONSE IS
REFERENCED FROM THE MIDPOINT OF THE SWITCHING SIGNAL, V , TO A POINT 0.5V ABOVE V . THIS POINT REPRESENTS NOISE MARGIN THAT AS-
M
OL
SURES TRUE SWITCHING HAS OCCURRED. BEYOND THIS LEVEL, THE EFFECTS OF EXTERNAL CIRCUITRY AND TEST ENVIRONMENT ARE PRONOUNCED
AND CAN GREATLY AFFECT THE RESULTANT MEASUREMENT.
SD00190
Figure 8. Interrupt Timing
22
2000 Jan 31
NXP [ NXP ]
