Device
System control module
PRCM
IO_PAD
CONTROL_PADCONF_X
WKUP_ENABLE
WAKEUPEVENT
WAKEUPENABLE
scm-012
Public Version
SCM Functional Description
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Figure 13-11. Wake-Up Event Detection Overview
For more information about the wake-up sequences, see
, Power, Reset, and Clock
Management.
NOTE:
When wake-up detection is enabled for a pad, the pad must be configured as input to avoid
contention between the device output buffer and an external driver. If this pin is already
configured as an input in active mode, hardware automatically retains the same input state;
no software action is required.
If this pin is configured as an output in active mode, the OFF override function must be
enabled to set the pin as an input during off mode: in the CONTROL.CONTROL_PADCONF
register, set OFFENABLE to 0x1 to enable the OFF override function, and set
OFFOUTENABLE to 0x1 to switch this pin to input mode.
lists the bit directions of the CONTROL_PADCONF_x registers.
Table 13-7. Bit Directions for CONTROL_PADCONF_x Registers
CONTROL_PADCONF_x Bit
Bit Direction
0
1
PULLUDENABLE
Not activated
Activated
PULLTYPESELECT
Pulldown
Pullup
INPUTENABLE
Input enable signal inactive
Input enable signal active
OFFENABLE
Off mode values are invalid.
Off mode values are valid.
OFFOUTENABLE
Output
Input
OFFOUTVALUE
Low
High
OFFPULLUDENABLE
Not activated
Activated
OFFPULLTYPESELECT
Pulldown
Pullup
WAKEUPENABLE
Disable I/O wake-up function.
Enable I/O wake-up function.
WAKEUPEVENT
Wake-up event not detected
Detect wake-up event.
13.4.5 Extended-Drain I/O Pin and PBIAS Cells
The device mainly supports 1.8-V I/O voltage on its interfaces, with the exception of MMC/SD/SDIO1
interface, which supports both 1.8-V and 3.0-V voltages through internal PBIAS generation and
extended-drain I/Os.
The need for embedded extended-drain I/Os on MMC/SD/SDIO1 interface and another interface, which is
2466
System Control Module
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated