AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 43

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Brownout Manager
6071A–ATARM–28-Oct-04
This feature allows the Reset Controller to shape the NRST pin level, and thus to guarantee
that the NRST line is driven low for a time compliant with potential external devices connected
on the system reset.
Brownout detection prevents the processor from falling into an unpredictable state if the power
supply drops below a certain level. When VDDCORE drops below the brownout threshold, the
brownout manager requests a brownout reset by asserting the bod_reset signal.
The programmer can disable the brownout reset by setting low the bod_rst_en input signal,
i.e.; by locking the corresponding general-purpose NVM bit in the Flash. When the brownout
reset is disabled, no reset is performed. Instead, the brownout detection is reported in the bit
BODSTS of RSTC_SR. BODSTS is set and clears only when RSTC_SR is read.
The bit BODSTS can trigger an interrupt if the bit BODIEN is set in the RSTC_MR.
At factory, the brownout reset is disabled.
Figure 15. Brownout Manager
bod_rst_en
brown_out
RSTC_SR
BODSTS
AT91SAM7S32 Preliminary
RSTC_MR
BODIEN
interrupt
sources
Other
bod_reset
rstc_irq
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