AT32UC3A464 Atmel Corporation, AT32UC3A464 Datasheet - Page 203

• Manufacturer Part Number: AT32UC3A464
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A464

• Flash (kbytes): 64 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• 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
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

15.6.7.3
Figure 15-27. NWAIT Assertion in Write Access: Ready Mode (MODE.EXNWMODE = 3).
32072G–11/2011
In te rn a lly syn ch ro n ize d
N W A IT s ig 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
15-28 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 15-28 on page
4
5
4
3
204. After deassertion, the access is completed: the hold step of the access is
204.
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 15-27 on page 203
0
1
0
and
Figure
Fig-
203