AT85C51SND3Bx
AC Characteristics
NFC Interface
Definition of Symbols
Table 1. NFC Interface Timing Symbol Definitions
Signals
Conditions
D
O
R
W
E
NFD7:0 In
NFD7:0 Out
NFRE
H
High
L
Low
V
X
Z
Valid
NFWE
No Longer Valid
Floating
NFCEn
A
NFALE
C
NFCLE
Timings
Table 267. NFC Interface AC timings
VDD = 1.65 to 3.6 V; TA = -40 to +85°C, CL ≤ 40pF (4 NF)
Symbol
TELWH
Parameter
Min
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NFCEn Write Setup Time
NFCEn Write Hold Time
NFCLE Setup Time
NFCLE Hold Time
NFALE Setup Time
NFALE Hold Time
NFWE Pulse Width
Data Setup Time
3·TNFC-??
1·TNFC-??
3·TNFC-??
1·TNFC-??
3·TNFC-??
1·TNFC-??
2·TNFC-??
2·TNFC-??
1·TNFC-??
TWHEH
TCHWH
TWHCL
TAHWH
TWHAL
TWLWH
TOVWH
TWHOX
TELDV
Data Hold Time
NFCEn Access Time
??
??
2·TNFC-??
3·TNFC-??
TRLRH
NFRE Pulse Width
ns(1)
TRLDV
TRHDX
TRHDZ
TEHDZ
Note:
NFRE Access Time
Data Hold Time
ns
ns
ns
ns
??
Data Float after NFRE High
Data Float after NFCEn High
1. Refer to TRS bit in NFCON register.
??
??
9
7632A–MP3–03/06
ATMEL [ ATMEL ]
