LM3S3748 Datasheet, PDF (701/753 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S3748 Microcontroller
24.2.9
General-Purpose I/O
Note: All GPIOs are 5 V-tolerant.
Table 24-18. GPIO Characteristics
Parameter Parameter Name
Condition
Min Nom Max Unit
t_GPIOR GPIO Rise Time (from 20% to 80% of V_DD)
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
t_GPIOF GPIO Fall Time (from 80% to 20% of V_DD)
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
R_GPIOPU GPIO internal pull-up resistor
R_GPIOPD GPIO internal pull-down resistor
Pull-up enabled
Pull-down enabled
50 - 110 kΩ
55 - 180 kΩ
24.2.10 Reset
Table 24-19. 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-On Reset timeout
- 10 - ms
R4
T_BOR Brown-Out timeout
- 500 - µs
R5
T_IRPOR Internal reset timeout after POR
R6
T_IRBOR Internal reset timeout after BOR^a
6 - 11 ms
0 - 1 µs
R7
T_IRHWR Internal reset timeout after hardware reset (RST pin)
0 - 1 ms
R8
T_IRSWR Internal reset timeout after software-initiated system reset ^a 2.5 - 20 µs
R9
T_IRWDR Internal reset timeout after watchdog reset^a
2.5 - 20 µs
R10
T_VDDRISE Supply voltage (V_DD) rise time (0V-3.3V)
- - 250 ms
R11
T_MIN Minimum RST pulse width
2 - - µs
a. 20 * t _{MOSC_per}
Figure 24-9. External Reset Timing (RST)
RST
/Reset
(Internal)
R11
R7
April 08, 2008
701
Preliminary