at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 107

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

14. Reset Controller (RSTC)
14.1
14.2
Figure 14-1. Reset Controller Block Diagram
14.3
14.3.1
6249D–ATARM–20-Dec-07
Description
Block Diagram
Functional Description
Reset Controller Overview
Backup Supply
Main Supply
WDRPROC
POR
POR
wd_fault
The Reset Controller (RSTC), based on power-on reset cells, handles all the resets of the sys-
tem without any external components. It reports which reset occurred last.
The Reset Controller also drives independently or simultaneously the external reset and the
peripheral and processor resets.
The Reset Controller is made up of an NRST Manager, a Startup Counter and a Reset State
Manager. It runs at Slow Clock and generates the following reset signals:
These reset signals are asserted by the Reset Controller, either on external events or on soft-
ware action. The Reset State Manager controls the generation of reset signals and provides a
signal to the NRST Manager when an assertion of the NRST pin is required.
The NRST Manager shapes the NRST assertion during a programmable time, thus controlling
external device resets.
• proc_nreset: Processor reset line. It also resets the Watchdog Timer.
• backup_nreset: Affects all the peripherals powered by VDDBU.
• periph_nreset: Affects the whole set of embedded peripherals.
• nrst_out: Drives the NRST pin.
NRST
nrst_out
Reset Controller
Counter
Startup
Manager
NRST
user_reset
exter_nreset
SLCK
AT91SAM9263 Preliminary
Manager
Reset
State
rstc_irq
proc_nreset
periph_nreset
backup_neset
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