Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X Datenbogen
Produktcode
DK-TM4C129X
32.6.1
V
DDA
Levels
The V
DDA
supply has three monitors:
■ Power-On Reset (POR)
■ Power-OK (POK)
■ Brown Out Reset (BOR)
The POR monitor is used to keep the analog circuitry in reset until the V
DDA
supply has reached
the correct range for the analog circuitry to begin operating. The POK monitor is used to keep the
digital circuitry in reset until the V
digital circuitry in reset until the V
DDA
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
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
DDA
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)
■
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.
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 230 for more information on how to configure these
registers.
registers.
Figure 32-4 on page 2109 shows the relationship between V
DDA
, POK, POR and a BOR event.
December 13, 2013
2108
Texas Instruments-Advance Information
Electrical Characteristics