LM3S610 Data Sheet
October 8, 2006 387
Preliminary
19.2.8 General-Purpose I/O
19.2.9 Reset
Table 19-13. GPIO Characteristics
a
a. All GPIOs are 5 V -toleran t.
Parameter Parameter Name Condition Min Nom Max Unit
t
GPIOR
GPO Rise T ime
(from 20% to 80%
of V
DD
)
2-mA drive - 17 2 6 ns
4-mA drive 9 13 ns
8-mA drive 6 9 ns
8-mA drive with slew rate control 10 12 ns
t
GPIOF
GPO Fall Time
(from 80% to 20%
of V
DD
)
2-mA drive - 17 2 5 ns
4-mA drive 8 12 ns
8-mA drive 6 10 ns
8-mA drive with slew rate control 11 13 ns
Table 19-14. Reset Characteristics
Parameter
No.
Parameter Parameter Name Min Nom Max Unit
R1 V
TH
Reset threshold - 2.0 - V
R2 V
BTH
Brown-Out threshold 2.85 2.9 2.95 V
R3 T
POR
Power-O n Reset timeout - 10 - ms
R4 T
BOR
Brown-Out timeout - 500 - μs
R5 T
IRPOR
Internal reset timeout after POR 15 - 30 ms
R6 T
IRBOR
Internal reset timeout after BOR
a
a. 20 * t
MOSC_PER
2.5 - 20 μs
R7 T
IRHWR
Internal reset timeout after hardware
reset (RST
pin)
15 - 30 ms
R8 T
IRSWR
Internal reset timeout after
sof t ware-initiated system res et
a
2.5 - 20 μs
R9 T
IRWDR
Internal reset timeout after watchdog
reset
a
2.5 - 20 μs
R10 T
IRLDOR
Internal reset timeout after LDO reset
a
2.5 - 20 μs
R11 T
VDDRISE
Supply voltage (V
DD
) rise time (0V-3.3V) 100 ms