pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 363

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

Revision 1.2
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
ACOv
AIs
AIh
CLKX
CLKXh
CLKXl
SCOv1
SIs1
SIh1
SCOv2
SIs2
SIh2
Symbol
1. Not tested; guaranteed by characterization.
Figure
154
154
154
154
154
155
155
155
155
155
155
156
156
156
URXD
UTXD
CLK
CMOS output rise time.
CMOS output fall time.
Output valid time
Input setup time
Input hold time
USCLK input period
USCLK input low time.
USCLK input high time.
Output hold valid time
Input setup time
Input hold time
Output hold valid time
Input setup time
Input hold time
1
t
AIS
Description
Figure 154. USART Asynchronous Mode Timing
2
(Continued)
1
t
ACOv
Synchronous Mode, USCLK Output
Synchronous Mode, USCLK Input
t
AIH
2
Asynchronous Mode
1
Note
Note
After RE CLK
Before RE CLK
After RE CLK
After RE USCLK
Before FE USCLK
After FE USCLK
After RE USCLK
Before FE USCLK
After FE USCLK
Reference Conditions
363
2
1
t
ACOv
2
1
t
t
r
f
2
t
t
CLKX
CLKX
Min
250
15
20
20
20
20
0
0
1
/ 2
/ 2
2
Max
20
25
20
6
6
1
1
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Unit
ns
ns
ns
ns
ns
ns
ns
ns
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ns
ns
ns
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