LM3S308 Luminary Micro, Inc, LM3S308 Datasheet - Page 391

• Manufacturer Part Number: LM3S308
• Description: Lm3s308 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

19.2.5
19.2.6
June 04, 2008
I
Table 19-11. I
a. Values depend on the value programmed into the TPR bit in the I
b. Because I2CSCL and I2CSDA are open-drain-type outputs, which the controller can only actively drive Low, the time
c. Specified at a nominal 50 pF load.
Figure 19-2. I
Synchronous Serial Interface (SSI)
Table 19-12. SSI Characteristics
Parameter
Parameter No.
Parameter No.
2
C
programmed for the maximum I2CSCL frequency (TPR=0x2) results in a minimum output timing as shown in the table
above. The I
period. The actual position is affected by the value programmed into the TPR; however, the numbers given in the above
values are minimum values.
I2CSCL or I2CSDA takes to reach a high level depends on external signal capacitance and pull-up resistor values.
A
A
HR
LR
I2CSDA
I1
I2
I3
I4
I5
I6
I7
I8
I9
S1
S2
S3
S4
S5
S6
S7
I2CSCL
a
a
b
a
c
a
a
a
a
Parameter Name
Absolute accuracy high range
Absolute accuracy low range
2
Parameter
Parameter
2
2
C interface is designed to scale the actual data transition time to move it to the middle of the I2CSCL Low
C Characteristics
C Timing
I1
t
t
t
t
clk_high
clk_low
clk_per
t
t
SCSR
t
t
t
t
t
t
SCH
t
t
t
DMd
DMs
DMh
t
SRT
SFT
SCS
clkrf
DH
HT
DS
LP
Parameter Name
Start condition hold time
Clock Low period
I2CSCL/I2CSDA rise time (V
Data hold time
I2CSCL/I2CSDA fall time (V
Clock High time
Data setup time
Start condition setup time (for repeated start condition
only)
Stop condition setup time
Parameter Name
SSIClk cycle time
SSIClk high time
SSIClk low time
SSIClk rise/fall time
Data from master valid delay time
Data from master setup time
Data from master hold time
I2
I4
Min
-
-
Preliminary
Nom
-
-
Max
±1/2
±1/4
I6
IH
IL
=2.4 V to V
=0.5 V to V
I7
Unit
LSB
LSB
Min
20
40
2
0
-
-
-
2
C Master Timer Period (I2CMTPR) register; a TPR
Nom
1/2
1/2
7.4
-
-
-
-
IL
IH
=0.5 V)
=2.4 V)
65024
Max
26
20
-
-
-
-
I5
I8
Min
system clocks
36
36
24
18
36
24
2
-
-
t clk_per
t clk_per
Unit
Nom
I3
ns
ns
ns
ns
9
-
-
-
-
-
-
-
-
LM3S308 Microcontroller
(see note b)
Max
10
-
-
-
-
-
-
-
system clocks
system clocks
system clocks
system clocks
system clocks
system clocks
system clocks
Unit
I9
ns
ns
391