SAM9M11 Atmel Corporation, SAM9M11 Datasheet - Page 33
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
SAM9M11
Manufacturer Part Number
SAM9M11
Description
Manufacturer
Atmel Corporation
Specifications of SAM9M11
Flash (kbytes)
0 Kbytes
Pin Count
324
Max. Operating Frequency
400 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
160
Ext Interrupts
160
Usb Transceiver
3
Usb Speed
Hi-Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
2
Uart
5
Lin
4
Ssc
2
Ethernet
1
Sd / Emmc
2
Graphic Lcd
Yes
Video Decoder
Yes
Camera Interface
Yes
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
440
Resistive Touch Screen
Yes
Dac Resolution (bits)
No
Temp. Sensor
No
Crypto Engine
AES/DES
Sram (kbytes)
64
Self Program Memory
NO
External Bus Interface
2
Dram Memory
DDR2/LPDDR, SDRAM/LPSDR
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
0.9 to 1.1
Fpu
No
Mpu / Mmu
No / Yes
Timers
6
Output Compare Channels
6
Input Capture Channels
6
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
8.6.1
8.6.2
8.6.3
6437CS–ATARM–8-Apr-11
Switch from Internal RC Oscillator to the 32768 Hz Crystal
Bypass the 32768 Hz Oscillator
Switch from 32768 Hz Crystal to the Internal RC Oscillator
Figure 8-3.
After a VDDBU power on reset, the default configuration is RCEN = 1, OSC32EN = 0 and OSC-
SEL = 0 allowing the system to start on the internal RC oscillator.
The programmer controls by software the slow clock switching and so must take precautions
during the switching phase.
To switch from internal RC oscillator to the 32768 Hz crystal, the programmer must execute the
following sequence:
The following step must be added to bypass the 32768 Hz Oscillator.
The same procedure must be followed to switch from 32768 Hz crystal to the internal RC
oscillator.
• Switch the master clock to a source different from slow clock (PLLA or PLLB or Main
• Enable the 32768 Hz oscillator by setting the bit OSCEN to 1.
• Wait 32768 Hz startup time for clock stabilization (software loop).
• Switch from internal RC to 32768 Hz by setting the bit OSCSEL to 1.
• Wait 5 slow clock cycles for internal resynchronization.
• Disable the RC oscillator by setting the bit RCEN to 0.
• An external clock must be connected on XIN32.
• Enable the bypass path OSC32BYP bit set to 1.
• Disable the 32768 Hz oscillator by setting the bit OSC32EN to 0.
• Switch the master clock to a source different from slow clock (PLLA or PLLB or Main
• Enable the internal RC oscillator by setting the bit RCEN to 1.
• Wait internal RC Startup Time for clock stabilization (software loop).
Oscillator) through the Power Manage8-Apr-11ment Controller.
Oscillator).
Slow Clock
XOUT32
XIN32
Clock Generator
Slow Clock
Oscillator
On Chip
RC OSC
RCEN
Slow Clock
SLCK
OSCSEL
OSC32EN
OSC32BYP
SAM9M11
33