Datasheet

62
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
11.5 SAM-BA Monitor
If no valid code has been found in NVM during the NVM bootloader sequence, the SAM-BA Monitor program is
launched.
The SAM-BA Monitor principle is to:
– Initialize DBGU and USB
– Check if USB Device enumeration has occurred.
– Check if characters have been received on the DBGU.
– Once the communication interface is identified, the application runs in an infinite loop waiting for
different commands as listed in Table .
SD Card
MCI0 MCI0_CK PIOA0
MCI0 MCI0_CD PIOA1
MCI0 MCI0_D0 PIOA2
MCI0 MCI0_D1 PIOA3
MCI0 MCI0_D2 PIOA4
MCI0 MCI0_D3 PIOA5
SPI Flash
SPI0 MOSI PIOB1
SPI0 MISO PIOB0
SPI0 SPCK PIOB2
SPI0 NPCS0 PIOB3
TWI0 EEPROM
TWI0 TWD0 PIOA20
TWI0 TWCK0 PIOA21
SAM-BA Monitor
DBGU DRXD PIOB12
DBGU DTXD PIOB13
Table 11-3. PIO Driven during Boot Program Execution (Continued)
NVM Bootloader Peripheral Pin PIO Line