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AT91SAM9G20 Datasheet(PDF) 25 Page - ATMEL Corporation

Part # AT91SAM9G20
Description  AT91 ARM Thumb Microcontrollers
PDF  832 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91SAM9G20 Datasheet(HTML) 25 Page - ATMEL Corporation

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6384D–ATARM–04-May-09
AT91SAM9G20 Preliminary
9.2
Reset Controller
• Based on two Power-on-Reset cell
– one on VDDBU and one on VDDCORE
• Status of the last reset
– Either general reset (VDDBU rising), wake-up reset (VDDCORE rising), software
reset, user reset or watchdog reset
• Controls the internal resets and the NRST pin output
– Allows shaping a reset signal for the external devices
9.3
Shutdown Controller
• Shutdown and Wake-Up logic
– Software programmable assertion of the SHDWN pin
– Deassertion Programmable on a WKUP pin level change or on alarm
9.4
Clock Generator
• Embeds a Low Power 32768 Hz Slow Clock Oscillator and a Low power RC oscillator
selectable with OSCSEL signal
– Provides the permanent Slow Clock SLCK to the system
• Embeds the Main Oscillator
– Oscillator bypass feature
– Supports 3 to 20 MHz crystals
• Embeds 2 PLLs
– The PLL A outputs 400-800 MHz clock
– The PLL B outputs 100 MHz clock
– Both integrate an input divider to increase output accuracy
– PLL A and PLL B embed their own filters



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