TM4C1290NCZAD Datasheet, PDF (1590/1648 Pages) Texas Instruments – Tiva Microcontroller

Electrical Characteristics
■ 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 261.
In addition, the following bits control both BOR events:
■ BORIM bit in the Interrupt Mask Control (IMC) register, System Control offset 0x054.
■ VDDA_UBOR0 and VDD_UBOR0 bits in the Power-Temperature Cause (PWRTC) register.
Please refer to “System Control” on page 215 for more information on how to configure these
registers.
Figure 26-4 on page 1590 shows the relationship between V_DDA, POK, POR and a BOR event.
Figure 26-4. Power and Brown-Out Assertions vs V_DDA Levels
VDDAMIN
P1
P5_RISE
P4
P6
P4
1
0
1
0
1
0
26.6.2
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
1590
Texas Instruments-Production Data
June 18, 2014