AT91SAM9261S-CU Atmel, AT91SAM9261S-CU Datasheet - Page 18

• Manufacturer Part Number: AT91SAM9261S-CU
• Description: ARM Microcontrollers - MCU BGA IND TEMP
• Manufacturer: Atmel
• Series: 91Sr

Specifications of AT91SAM9261S-CU

• Product Category: ARM Microcontrollers - MCU
• Rohs: yes
• Core: ARM926EJ-S
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 190 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 16 KB
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: BGA-217
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USB
• Length: 15 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 96
• Number Of Timers: 4
• Program Memory Type: ROM
• Factory Pack Quantity: 126
• Supply Voltage - Max: 1.32 V, 3.6 V
• Supply Voltage - Min: 1.08 V, 1.65 V, 2.7 V, 3 V

8.1.2.1
8.1.2.2
8.2
18
External Memories
AT91SAM9261S
BMS = 1, Boot on Embedded ROM
BMS = 0, Boot on External Memory
The system boots using the Boot Program.
The customer-programmed software must perform a complete configuration.
To speed up the boot sequence when booting at 32 kHz EBI CS0 (BMS=0), the user must take
the following steps:
The external memories are accessed through the External Bus Interface (Bus Matrix Slave 3).
Refer to the memory map in
• Enable the 32,768 Hz oscillator
• Auto baudrate detection
• Downloads and runs an application from external storage media into internal SRAM
• Automatic detection of valid application
• Bootloader on a non volatile memory
• SAM-BA Boot in case no valid program is detected in external NVM, supporting:
• Boot on slow clock (32,768 Hz)
• Boot with the default configuration for the Static Memory Controller, byte select mode, 16-bit
1. Program the PMC (main oscillator enable or bypass mode).
2. Program and start the PLL.
3. Reprogram the SMC setup, cycle, hold, mode timings registers for CS0 to adapt them
4. Switch the main clock to the new value.
data bus, Read/Write controlled by Chip Select, allows boot on 16-bit non-volatile memory.
– SPI Serial Flash or DataFlash connected to NPCS0 of the SPI0
– NAND Flash
– SDCARD (boot ROM does not support high capacity SDCards)
– Serial communication on a DBGU
– USB Device HS Port
to the new clock
Figure 8-1 on page
15.
6242ES–ATARM–11-Sep-09