AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 46

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

Brownout Reset
Figure 18. Brownout Reset State
46
AT91SAM7S32 Preliminary
periph_nreset
or bod_reset
proc_nreset
brown_out
(nrst_out)
RSTTYP
NRST
SLCK
MCK
When the brown_out/bod_reset signal is asserted, the Reset State Manager immediately
enters the Brownout Reset. In this state, the processor, the peripheral and the external reset
lines are asserted.
The Brownout Reset is left 3 Slow Clock cycles after the rising edge of brown_out/bod_reset
after a two-cycle resynchronization. An external reset is also triggered.
When the processor reset is released, the field RSTTYP in RSTC_SR is loaded with the value
0x5, thus indicating that the last reset is a Brownout Reset.
Freq.
Any
Any
Resynch.
2 cycles
XXX
Processor Startup
= 3 cycles
EXTERNAL RESET LENGTH
8 cycles (ERSTL=2)
0x5 = Brownout Reset
6071A–ATARM–28-Oct-04