AT32UC3C2256C Atmel Corporation, AT32UC3C2256C Datasheet - Page 332

• Manufacturer Part Number: AT32UC3C2256C
• Manufacturer: Atmel Corporation

Specifications of AT32UC3C2256C

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 45
• Ext Interrupts: 64
• Usb Transceiver: 1
• Quadrature Decoder Channels: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 68
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6 or 4.5 to 5.5
• Operating Voltage (vcc): 3.0 to 3.6 or 4.5 to 5.5
• Fpu: Yes
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 13
• Input Capture Channels: 6
• Pwm Channels: 14
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

18.6.7.3
Figure 18-27. NWAIT Assertion in Write Access: Ready Mode (MODE.EXNWMODE = 3).
32117C–AVR-08/11
In te rn a lly syn ch ro n iz e d
N W A IT sig n a l
A [A D _ M S B :2 ]
N B S 0 , N B S 1 ,
C L K _ S M C
A 0 , A 1
N W A IT
D [1 5 :0 ]
Ready mode
N C S
N W E
6
In Ready mode (MODE.EXNWMODE = 3), the SMC behaves differently. Normally, the SMC
begins the access by down counting the setup and pulse counters of the read/write controlling
signal. In the last cycle of the pulse phase, the resynchronized NWAIT signal is examined.
If asserted, the SMC suspends the access as shown in
18-28 on page
performed.
This mode must be selected when the external device uses deassertion of the NWAIT signal to
indicate its ability to complete the read or write operation.
If the NWAIT signal is deasserted before the end of the pulse, or asserted after the end of the
pulse of the controlling read/write signal, it has no impact on the access length as shown in
ure 18-28 on page
4
5
4
3
333. After deassertion, the access is completed: the hold step of the access is
333.
3
2
1
2
E X N W M O D E = 3 (R e a d y m o d e )
W R IT E M O D E = 1 (N W E _ co n tro lle d )
N W E P U L S E = 5
N C S W R P U L S E = 7
W rite cyc le
0
1
F R O Z E N S T A T E
0
1
Figure 18-27 on page 332
0
1
0
AT32UC3C
and
Figure
Fig-
332