AT32UC3A3256AU Atmel Corporation, AT32UC3A3256AU Datasheet - Page 207

• Manufacturer Part Number: AT32UC3A3256AU
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3256AU

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 110
• Ext Interrupts: 110
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 16
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 12
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

15.6.8.2
Figure 15-31. Clock Rate Transition Occurs while the SMC is Performing a Write Operation
32072G–11/2011
Internal signal from PM
Slow Clock Mode
NBS0, NBS1,
Switching from (to) slow clock mode to (from) normal mode
A[AD_MSB:2]
A0, A1
CLK_SMC
This write cycle finishes with the slow clock mode set
NWE
NCS
of parameters after the clock rate transition
When switching from slow clock mode to the normal mode, the current slow clock mode transfer
is completed at high clock rate, with the set of slow clock mode parameters. See
on page
Figure 15-32 on page 208
mode to the other.
SLOW CLOCK MODE WRITE SLOW CLOCK MODE WRITE
207. The external device may not be fast enough to support such timings.
1
NWECYCLE = 3
1
illustrates the recommended procedure to properly switch from one
1
1
1
Slow clock mode transition is detected:
1
Reload Configuration Wait State
2
NORMAL MODE WRITE
NWECYCLE = 7
3
2
Figure 15-31
207