at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 176

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Access Example
176
AT85C51SND3B
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In all the previous examples, the NFCE line is asserted low and de-asserted at the end
of the cycle. This allows minimizing the power consumption.
Figure 80 shows a read access in a 512B page. Note that the NFCE must be held low
during the access time for that kind of memory:
Assembly code: mov #, direct
Assembly code: mov #, direct
A read of NFDAT returns to the CPU the byte contained in that register, but does not
launch an extra background “read cycle”.
NFCLK / 2
NFCEx
NFCLE
NFALE
NFWE
NFRE
NFD[7:0]
NFCEx
NFCLE
NFALE
NFWE
NFRE
NFD[7:0]
CPU: 40 ns setup, timing [1.5; 0.5]
CPU: 40 ns setup Timing [1; 1]
Read data, TRS cleared
Read data, TRS set
[15;30] ns hold
[15;30] ns hold
7632C–MP3–11/06