Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Data Sheet
Product codes
ATSAM4L-XPRO
1170
42023E–SAM–07/2013
ATSAM4L8/L4/L2
Where
is the MISO delay, SPI6 or SPI9 depending on CPOL and NCPHA.
is the
SPI master setup time. refer to the SPI master datasheet for
.
is the maximum
frequency of the SPI pins. refer to the I/O Pin Characteristics section for the maximum frequency
of the pins.
of the pins.
42.10.4
TWIM/TWIS Timing
shows the TWI-bus timing requirements and the compliance of the device with
them. Some of these requirements (t
r
and t
f
) are met by the device without requiring user inter-
vention. Compliance with the other requirements (t
HD-STA
, t
SU-STA
, t
SU-STO
, t
HD-DAT
, t
SU-DAT-TWI
, t
LOW-
TWI
, t
HIGH
, and f
TWCK
) requires user intervention through appropriate programming of the relevant
TWIM and TWIS user interface registers. refer to the TWIM and TWIS sections for more
information.
information.
Notes:
1. Standard mode:
; fast mode:
.
SPIn
t
SETUP
t
SETUP
f
PINMAX
Table 42-64. TWI-Bus Timing Requirements
Symbol
Parameter
Mode
Minimum
Maximum
Unit
Requirement
Device
Requirement
Device
t
r
TWCK and TWD rise time
Standard
-
1000
ns
Fast
20 + 0.1C
b
300
t
f
TWCK and TWD fall time
Standard
-
300
ns
Fast
20 + 0.1C
b
300
t
HD-STA
(Repeated) START hold time
Standard
4
t
clkpb
-
μs
Fast
0.6
t
SU-STA
(Repeated) START set-up time
Standard
4.7
t
clkpb
-
μs
Fast
0.6
t
SU-STO
STOP set-up time
Standard
4.0
4t
clkpb
-
μs
Fast
0.6
t
HD-DAT
Data hold time
Standard
0.3
2t
clkpb
3.45
15t
prescaled
+ t
clkpb
μs
Fast
t
SU-DAT-TWI
Data set-up time
Standard
250
2t
clkpb
-
ns
Fast
100
t
SU-DAT
-
-
t
clkpb
-
-
t
LOW-TWI
TWCK LOW period
Standard
4.7
4t
clkpb
-
μs
Fast
1.3
t
LOW
-
-
t
clkpb
-
-
t
HIGH
TWCK HIGH period
Standard
4.0
8t
clkpb
-
μs
Fast
0.6
f
TWCK
TWCK frequency
Standard
-
100
kHz
Fast
400
1
12t
clkpb
------------------------
f
TWCK
100 kHz
≤
f
TWCK
100 kHz
>