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LM3S8938 Datasheet, PDF (523/550 Pages) List of Unclassifed Manufacturers – Microcontroller
LM3S8938 Microcontroller
Table 22-25. GPIO Characteristics
Parameter Parameter Name
Condition
Min Nom Max Unit
tGPIOR GPIO Rise Time (from 20% to 80% of VDD)
2-mA drive
4-mA drive
- 17 26 ns
9 13 ns
8-mA drive
6 9 ns
8-mA drive with slew rate control
10 12 ns
tGPIOF GPIO Fall Time (from 80% to 20% of VDD)
2-mA drive
4-mA drive
- 17 25 ns
8 12 ns
8-mA drive
6 10 ns
8-mA drive with slew rate control
11 13 ns
22.2.12 Reset
Table 22-26. Reset Characteristics
Parameter No. Parameter Parameter Name
R1
VTH Reset threshold
R2
VBTH Brown-Out threshold
R3
TPOR Power-On Reset timeout
R4
TBOR Brown-Out timeout
R5
TIRPOR Internal reset timeout after POR
R6
TIRBOR
Internal reset timeout after BOR
a
Min Nom Max Unit
- 2.0 - V
2.85 2.9 2.95 V
- 10 - ms
- 500 - µs
6 - 11 ms
0 - 1 µs
R7
TIRHWR Internal reset timeout after hardware reset (RST pin)
0 - 1 ms
R8
TIRSWR Internal reset timeout after software-initiated system reset a 2.5 - 20 µs
R9
TIRWDR Internal reset timeout after watchdog reseta
2.5 - 20 µs
R10
TVDDRISE Supply voltage (VDD) rise time (0V-3.3V)
- - 100 ms
R11
TMIN Minimum RST pulse width
2 - - µs
a. 20 * t MOSC_per
Figure 22-11. External Reset Timing (RST)
RST
/Reset
(Internal)
R11
R7
June 14, 2007
523
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