Philips Semiconductors Product data sheet
SCC2698B
Enhanced octal universal asynchronous
receiver/transmitter (Octal UART)
2006 Aug 07
22
RDN
WRN
MPOx
MPIx OR
MPPx
t
PS
t
PH
t
PD
t
PD
RDN
OLD DATA NEW DATA
SD00189
Figure 7. Port Timing
WRN
INTERRUPT
1
OUTPUT
RDN
INTERRUPT
1
OUTPUT
V
M
t
IR
t
IR
V
OL
+0.5V
V
OL
+0.5V
V
OL
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
M
, TO A POINT 0.5V ABOVE V
OL
. THIS POINT REPRESENTS NOISE MARGIN THAT AS-
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
