National CP3BT26 User Manual
249
www.national.com
CP3
BT26
30.8
UART TIMING
Figure 114.
UART Asynchronous Mode Timing
Table 85
UART Signals
Symbol Figure
Description
Reference
Min (ns)
Max (ns)
UART Input Signals
t
Is
Input setup time
RXD (asynchronous mode)
RXD (asynchronous mode)
Before Rising Edge (RE)
on CLK
on CLK
-
t
Ih
Input hold time
RXD (asynchronous mode)
RXD (asynchronous mode)
After RE on CLK
-
UART Output Signals
t
COv1
TXD output valid (all signals with
propagation delay from CLK RE)
propagation delay from CLK RE)
After RE on CLK
-
t
TXD
TXD output valid
After RE on CLK
-
40
CLK
TXD
RXD
1
t
COv1
t
lS
t
lH
t
COv1
1
1
2
2
2
1
1
1
2
2
2
DS098