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System Control

The watchdog reset timing is shown in Figure 23-9 on page 576.

6.1.3Power Control

The Stellaris® microcontroller provides an integrated LDO regulator that may be used to provide powertothemajorityofthecontroller'sinternallogic. Forpowerreduction,theLDOregulatorprovides software a mechanism to adjust the regulated value, in small increments (VSTEP), over the range of 2.25 V to 2.75 V (inclusive)—or 2.5 V ± 10%. The adjustment is made by changing the value of the VADJ field in the LDO Power Control (LDOPCTL) register.

Figure 6-2 on page 71 shows the power architecture.

Note: On the printed circuit board, use the LDO output as the source of VDD25 input. In addition, the LDO requires decoupling capacitors. See “On-Chip Low Drop-Out (LDO) Regulator Characteristics” on page 570.

70

November 16, 2008

Preliminary

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