AT32UC3C2512C Automotive Atmel Corporation, AT32UC3C2512C Automotive Datasheet - Page 321

• Manufacturer Part Number: AT32UC3C2512C Automotive
• Manufacturer: Atmel Corporation

9166C–AVR-08/11
An early read wait state is automatically inserted if at least one of the following conditions is
valid:
Figure 18-16. Early Read Wait State: Write with No Hold Followed by Read with No Setup.
• if the write controlling signal has no hold time and the read controlling signal has no setup
• in NCS write controlled mode (MODE.WRITEMODE = 0), if there is no hold timing on the
• in NWE controlled mode (MODE.WRITEMODE = 1) and if there is no hold timing
time
NCS signal and the NCSRDSETUP parameter is set to zero, regardless of the read mode
(Figure 18-17 on page
an early read wait state, the write operation could not complete properly.
(NWEHOLD = 0), the feedback of the write control signal is used to control address, data,
chip select, and byte select lines. If the external write control signal is not inactivated as
expected due to load capacitances, an early read wait state is inserted and address, data
and control signals are maintained one more cycle. See
NBS0, NBS1,
A[AD_MSB:2]
(Figure 18-16 on page
A0, A1
CLK_SMC
D[15:0]
NWE
NRD
322). The write operation must end with a NCS rising edge. Without
Write cycle
321).
No hold
Early Read
Wait state
Figure 18-18 on page
No setup
Read cycle
AT32UC3C
323.
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