pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 404

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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7.0 Device Specifications
7.6.14 USART Timing
t
t
t
t
t
t
t
t
t
t
t
t
t
t
r
f
COh2
COv2
COh
Is
Ih
CLKX
CLKh
CLKl
SIs
SIh
SIs1
SIh1
Symbol
1. Not tested; guaranteed by characterization.
Figure
162
162
163
163
162
162
162
162
162
162
163
163
164
164
Output Signals:
Input Signals:
USCLK (In)
CMOS output rise time.
CMOS output fall time.
Output hold (synchr. mode)
Output valid (synchr. mode)
Output hold (synchr. mode)
Input setup time
Input hold time
USCLK input period (synchr.
mode)
USCLK input low time.
USCLK input high time.
Input Setup time (synchr.
mode)
Input Hold time (synchr.
mode)
Input Setup time (synchr.
mode)
Input Hold time (synchr.
mode)
(asynchr. mode)
(asynchr. mode)
USCLK
UTXD
CLK
URXD
Description
Figure 162. USART Asynchronous Mode Timing
(Continued)
1
t
IS
2
t
COv
1
Note
Note
After RE USCLK
After RE USCLK
After RE USCLK
Before RE CLK
After RE CLK
Before FE USCLK (in)
in synchronous mode
After FE USCLK (in)
in synchronous mode
Before FE USCLK (out)
in synchronous mode
After FE USCLK (out)
in synchronous mode
t
IH
Reference Conditions
404
2
1
1
1
2
t
1
COv
2
+10 ns)
t
t
10 ns
10 ns
2t
2t
CLK
(2t
CLK
Min
250
15
20
20
CLK
CLK
20
0
CLK
1
t
t
f
r
2
+10 ns
2t
Max
CLK
6
6
1
2
Unit
ns
ns
ns
ns
ns
ns
ns
ns
Revision 1.07
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