lpc11c12 NXP Semiconductors, lpc11c12 Datasheet - Page 37

• Manufacturer Part Number: lpc11c12
• Description: 32-bit Cortex-m0 Microcontroller; 16/32 Flash, Sram; C_can
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 14.
LPC11C12_C14_0
Preliminary data sheet
Symbol
T
T
SPI master (in SPI mode)
t
t
t
t
SPI slave (in SPI mode)
t
DS
DH
v(Q)
h(Q)
DS
Fig 19. I
cy(PCLK)
cy(clk)
SDA
SCL
2
C-bus pins clock timing
Dynamic characteristics of SPI pins in SPI mode
Parameter
PCLK cycle time
clock cycle time
data set-up time
data hold time
data output valid time in SPI mode
data output hold time in SPI mode
data set-up time
70 %
30 %
S
10.6 SPI interfaces
t
f
t
f
70 %
[6]
[7]
[8]
[9]
[10] A Fast-mode I
30 %
The maximum t
output stage t
SDA and the SCL pins and the SDA/SCL bus lines without exceeding the maximum specified t
In Fast-mode Plus, fall time is specified the same for both output stage and bus timing. If series resistors
are used, designers should allow for this when considering bus timing.
The maximum t
the maximum of t
the device does not stretch the LOW period (t
data must be valid by the set-up time before it releases the clock.
t
transmission and the acknowledge.
250 ns must then be met. This will automatically be the case if the device does not stretch the LOW period
of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next
data bit to the SDA line t
specification) before the SCL line is released. Also the acknowledge timing must meet this set-up time.
1 / f
SU;DAT
SCL
Conditions
in SPI mode
in SPI mode
in SPI mode
is the data set-up time that is measured with respect to the rising edge of SCL; applies to data in
2.0 V ≤ V
1.8 V ≤ V
t
HD;DAT
70 %
30 %
70 %
f
2
30 %
All information provided in this document is subject to legal disclaimers.
is specified at 250 ns. This allows series protection resistors to be connected in between the
C-bus device can be used in a Standard-mode I
HD;DAT
f
for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA
VD;DAT
t
SU;DAT
DD
DD
could be 3.45 μs and 0.9 μs for Standard-mode and Fast-mode but must be less than
< 2.0 V
≤ 3.6 V
Rev. 00.05 — 6 May 2010
or t
r(max)
VD;ACK
+ t
70 %
SU;DAT
30 %
[1]
[2]
[2]
[2]
[2]
[3][4]
by a transition time (see UM10204). This maximum must only be met if
t
LOW
= 1000 + 250 = 1250 ns (according to the Standard-mode I
Min
20
40
27
36
0
-
0
0
LOW
) of the SCL signal. If the clock stretches the SCL, the
t
HIGH
70 %
30 %
t
2
VD;DAT
C-bus system but the requirement t
Typ
-
-
-
-
-
-
-
-
LPC11C12/C14
Max
-
-
-
-
-
10
-
-
© NXP B.V. 2010. All rights reserved.
002aaf425
f
.
2
SU;DAT
37 of 49
C-bus
Unit
ns
ns
ns
ns
ns
ns
ns
ns
=