AT91SAM9G20-CU View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT91SAM9G20-CU Datasheet PDF : 42 Pages
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– Source 0 is reserved for the Fast Interrupt Input (FIQ)
– Source 1 is reserved for system peripherals
– Programmable Edge-triggered or Level-sensitive Internal Sources
– Programmable Positive/Negative Edge-triggered or High/Low Level-sensitive
• Three External Sources plus the Fast Interrupt signal
• 8-level Priority Controller
– Drives the Normal Interrupt of the processor
– Handles priority of the interrupt sources 1 to 31
– Higher priority interrupts can be served during service of lower priority interrupt
• Vectoring
– Optimizes Interrupt Service Routine Branch and Execution
– One 32-bit Vector Register per interrupt source
– Interrupt Vector Register reads the corresponding current Interrupt Vector
• Protect Mode
– Easy debugging by preventing automatic operations when protect models are
enabled
• Fast Forcing
– Permits redirecting any normal interrupt source on the Fast Interrupt of the
processor
9.11 Debug Unit
• Composed of two functions:
– Two-pin UART
– Debug Communication Channel (DCC) support
• Two-pin UART
– Implemented features are 100% compatible with the standard Atmel ® USART
– Independent receiver and transmitter with a common programmable Baud Rate
Generator
– Even, Odd, Mark or Space Parity Generation
– Parity, Framing and Overrun Error Detection
– Automatic Echo, Local Loopback and Remote Loopback Channel Modes
– Support for two PDC channels with connection to receiver and transmitter
• Debug Communication Channel Support
– Offers visibility of and interrupt trigger from COMMRX and COMMTX signals from
the ARM Processor’s ICE Interface
9.12
Chip Identification
• Chip ID:0x019905A1
• JTAG ID: 0x05B2403F
• ARM926 TAP ID:0x0792603F
28 AT91SAM9G20 Summary
6384CS–ATARM–11-Mar-09
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