The AT91SAM9G25-CU is a SMART 400MHz 32-bit Embedded Microprocessor Unit based on ARM926EJ-S processor. The SAM9G25 interface peripherals include a camera interface that supports direct connection to the ITU-R BT. 601/656 8-bit mode compliant sensors and up to 12-bit grayscale sensors. Communication peripherals include a soft modem supporting exclusively the conexant SmartDAA line driver, HS (480Mbps) USB host and device ports with on-chip transceivers, FS USB host, 10/100 Ethernet MAC, two HS SDCard/SDIO/MMC interfaces, USARTs, SPIs, I²S, multiple TWIs and 10-bit ADC. The multi-layer bus matrix is linked to 2 x 8 DMA channels as well as DMAs dedicated to the communication and interface peripherals, ensuring uninterrupted data transfers with minimal processor overhead. The External Bus Interface incorporates controllers for 4-bank and 8-bank DDR2/LPDDR, SDRAM/LPSDRAM, static memories, as well as specific circuitry for MLC/SLC NAND flash with integrated ECC up to 24 -bit.
● ARM926EJ-S ARM Thumb processor running at up to 400MHz at 1.0V ±10%
● 16kB Data cache, 16kB Instruction cache, memory management unit
● Power-on reset cells, reset controller, shutdown controller, periodic interval timer, WDT and RTC
● Boot mode select option, remap command
● Internal low power 32kHz RC and fast 12MHz RC oscillators
● Selectable 32768Hz low-power oscillator and 12MHz oscillator
● One PLL for the system and one PLL at 480MHz optimized for USB high speed
● Twelve 32-bit-layer AHB bus matrix for large bandwidth transfers
● Dual peripheral bridge with dedicated programmable clock for best performances
● Two dual port 8-channel DMA controllers (DMAC)
● Advanced interrupt controller (AIC) and debug unit (DBGU)
● Two programmable external clock signals
● Shutdown controller with four 32-bit battery backup registers
● Clock generator and power management controller
● Very slow clock operating mode, software programmable power optimization capabilities
● Four 32-bit parallel I/O controllers
● 105 Programmable I/O lines multiplexed with up to three peripheral I/Os
● Input change interrupt capability on each I/O line, optional Schmitt trigger input
● Individually programmable open-drain, pull-up and pull-down resistor, synchronous output
● ITU-R BT. 601/656 Image sensor interface (ISI)
