AT32UC3A3256 Atmel Corporation, AT32UC3A3256 Datasheet - Page 206

• Manufacturer Part Number: AT32UC3A3256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3256

• 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
15.6.8.1
Figure 15-30. Read and Write Cycles in Slow Clock Mode
32072G–11/2011
NBS0, NBS1,
A[AD_MSB:2]
A0, A1
CLK_SMC
NWE
NCS
Slow Clock Mode
Slow clock mode waveforms
SLOW CLOCK MODE WRITE
1
NWECYCLES = 3
The SMC is able to automatically apply a set of “slow clock mode” read/write waveforms when
an internal signal driven by the SMC’s Power Management Controller is asserted because
CLK_SMC has been turned to a very slow clock rate (typically 32 kHz clock rate). In this mode,
the user-programmed waveforms are ignored and the slow clock mode waveforms are applied.
This mode is provided so as to avoid reprogramming the User Interface with appropriate wave-
forms at very slow clock rate. When activated, the slow mode is active on all chip selects.
Figure 15-30 on page 206
valid on all chip selects.
ters in slow clock mode.
Table 15-5.
Read Parameters
NRDSETUP
NRDPULSE
NCSRDSETUP
NCSRDPULSE
NRDCYCLE
1
Read and Write Timing Parameters in Slow Clock Mode
1
Duration (cycles)
Table 15-5 on page 206
illustrates the read and write operations in slow clock mode. They are
1
1
0
2
2
Write Parameters
NWESETUP
NWEPULSE
NCSWRSETUP
NCSWRPULSE
NWECYCLE
NBS0, NBS1,
A[AD_MSB:2]
indicates the value of read and write parame-
A0, A1
CLK_SMC
NRD
NCS
SLOW CLOCK MODE READ
NRDCYCLES = 2
1
Duration (cycles)
1
1
0
3
3
1
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