ATSAM3U_10 ATMEL [ATMEL Corporation], ATSAM3U_10 Datasheet - Page 26

• Manufacturer Part Number: ATSAM3U_10
• Description: AT91ARM Cortex M3-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

7. Processor and Architecture
7.1
7.2
7.3
26
ARM Cortex-M3 Processor
APB/AHB Bridges
Matrix Masters
SAM3U Series
Even in all low power modes, asserting the pin will automatically start-up the chip and erase the
Flash.
The SAM3U product embeds two separated APB/AHB bridges:
This architecture enables to make concurrent accesses on both bridges.
All the peripherals are on the low-speed bridge except SPI, SSC and HSMCI.
The UART,
channels for the Peripheral DMA Channels (PDC). These peripherals can not use the DMA
Controller.
The high speed bridge regroups the SSC, SPI and HSMCI. These three peripherals do not have
PDC channels but can use the DMA with the internal FIFO for Channel buffering.
Note that the peripherals of the two bridges are clocked by the same source: MCK.
The Bus Matrix of the SAM3U device manages 5 masters, which means that each master can
perform an access concurrently with others to an available slave.
Each master has its own decoder and specifically defined bus. In order to simplify the address-
ing, all the masters have the same decoding.
Table 7-1.
Master 0
Master 1
Master 2
Master 3
Master 4
• Version 2.0
• Thumb-2 (ISA) subset consisting of all base Thumb-2 instructions, 16-bit and 32-bit.
• Harvard processor architecture enabling simultaneous instruction fetch with data load/store.
• Three-stage pipeline.
• Single cycle 32-bit multiply.
• Hardware divide.
• Thumb and Debug states.
• Handler and Thread modes.
• Low latency ISR entry and exit.
• low speed bridge
• high speed bridge
10-bit ADC (ADC), 12-bit ADC (ADC12B)
List of Bus Matrix Masters
Cortex-M3 Instruction/Data
Cortex-M3 System
Peripheral DMA Controller (PDC)
USB Device High Speed DMA
DMA Controller
, TWI0-1, USART0-3, PWM have dedicated
6430CS–ATARM–09-Apr-10