SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 234
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SC2200
Manufacturer Part Number
SC2200
Description
Thin Client On a Chip
Manufacturer
NSC [National Semiconductor]
Datasheet
1.SC2200.pdf
(433 pages)
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Core Logic Module
Offset 28h-2Bh
31:1
Bit
4
3
2
1
0
0
Description
PME Edge/Level Select. Selects the type (edge or level) of the signal that issues a PME from the selected GPIO signal.
0: Edge input. (Default)
1: Level input.
For normal operation, always set this bit to 0 (edge input). Erratic system behavior results if this bit is set to 1.
See the note in the description of this register for more information about the default value of this bit.
Lock. This bit locks the selected GPIO signal. Once this bit is set to 1 by software, it can only be cleared to 0 by power on
reset or by WATCHDOG reset.
0: No effect. (Default)
1: Direction, output type, pull-up and output value locked.
Pull-Up Control. Enables/disables the internal pull-up capability of the selected GPIO signal. It supports open-drain output
signals with internal pull-ups and TTL input signals.
0: Disable.
1: Enable. (Default)
Bits [1:0] of this register must = 01 for this bit to have effect.
Output Type. Controls the output buffer type (open-drain or push-pull) of the selected GPIO signal.
0: Open-drain. (Default)
1: Push-pull.
Bit 0 of this register must be set to 1 for this bit to have effect.
Output Enable. Indicates the GPIO signal output state. It has no effect on input.
0: TRI-STATE - Setting for GPIO to function as an input only. (Default)
1: Output enabled.
Reserved. Must be set to 0.
GPIO Reset. Reset the GPIO logic.
0: Disable.
1: Enable.
Write 0 to clear.
This bit is level-sensitive and must be cleared after the reset is enabled (normal operation requires this bit to be 0).
Table 5-30. F0BAR0+I/O Offset: GPIO Configuration Registers (Continued)
(Continued)
GPIO Reset Control Register (R/W)
234
Reset Value: 00000000h
Revision 3.0
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