Datasheet

Figure 32-4. Power and Brown-Out Assertions vs V
DDA
Levels
P1
VDDA
P5
RISE
P4
PORPOKBOR
P4
1
VDDA
MIN
1
1
0
0
0
P6
32.6.2 V
DD
Levels
The V
DD
supply has two monitors:
■ Power-OK (POK)
■ Brown Out Reset (BOR)
The POK monitor is used to keep the digital circuitry in reset until the V
DD
power supply is at an
acceptable operational level. The digital reset is only released when the Power-On Reset has
deasserted and all of the Power-OK monitors for each of the supplies indicate that power levels are
in operational ranges. The BOR monitor is used to generate a reset to the device or assert an
interrupt if the V
DD
supply drops below its operational range.
Note: V
DDA
BOR and V
DD
BOR events are a combined BOR to the system logic, such that if either
BOR event occurs, the following bits are affected:
■ BORRIS bit in the Raw Interrupt Status (RIS) register, System Control offset 0x050.
See page 272.
■ BORMIS bit in the Masked Interrupt Status and Clear (MISC) register, System Control
offset 0x058. This bit is set only if the BORIM bit in the Interrupt Mask Control (IMC)
register has been set. See page 274 and page 276.
■ BOR bit in the Reset Cause (RESC) register, System Control offset 0x05C. This bit is
set only if either of the BOR events have been configured to initiate a reset. See page 278.
2109December 13, 2013
Texas Instruments-Advance Information
Tiva
™
TM4C129XNCZAD Microcontroller