![NXP Semiconductors MWCT101 S Series Скачать руководство пользователя страница 1459](http://html1.mh-extra.com/html/nxp-semiconductors/mwct101-s-series/mwct101-s-series_reference-manual_17222101459.webp)
The following timing restrictions must be enforced to avoid unexpected START or STOP
conditions on the I2C bus, or to avoid unexpected START or STOP conditions detected
by the LPI2C master. The timing restrictions can be summarized as SDA cannot change
when SCL is high outside of a transmitted (repeated) START or STOP condition.
Table 46-9. LPI2C Timing Parameter Restrictions
Timing Parameter
Minimum
Maximum
Comment
CLKLO
0x03
-
Also: CLKLO x (2 ^ PRESCALE) >
SCL_LATENCY
CLKHI
0x01
-
Configure CLKHI to meet the duty cycle
requirements in the I2C specification
SETHOLD
0x02
-
DATAVD
0x01
CLKLO - SDA_LATENCY
- 1
Configure DATAVD to meet the data
hold requirement in the I2C specification
FILTSCL
0x00
[CLKLO x (2 ^
PRESCALE)] - 3
FILTSCL and FILTSDA are the only
parameters not multiplied by (2 ^
PRESCALE)
FILTSDA
FILTSCL
[CLKLO x (2 ^
PRESCALE)] - 3
Configuring FILTSDA greater than
FILTSCL can delay the SDA input to
compensate for board level skew
BUSIDLE
(CLKLO+2) x
2
-
Must also be greater than (CLKHI+1)
The timing parameters must be configured to meet the requirements of the I2C
specification; this will depend on the mode being supported and the LPI2C functional
clock frequency. When switching between two modes using the different clock
configuration registers (for example, Fast and HS-mode), the PRESCALE factor must
remain constant between the modes. Some example timing configurations are provided
below.
Table 46-10. LPI2C Example Timing Configurations
I2C Mode
Clock
Frequency
Baud
Rate
PRESCALE
FILTSCL /
FILTSDA
SETHOLD
CLKLO
CLKHI
DATAVD
Fast
8 MHz
400 kbps
0x0
0x0/0x0
0x04
0x0B
0x05
0x02
Fast+
8 MHz
1 Mbps
0x0
0x0/0x0
0x02
0x03
0x01
0x01
Fast
48 MHz
400 kbps
0x0
0x1/0x1
0x1D
0x3E
0x35
0x0F
Fast
48 MHz
400 kbps
0x2
0x1/0x1
0x07
0x11
0x0B
0x03
Fast+
48 MHz
1 Mbps
0x2
0x1/0x1
0x03
0x06
0x04
0x04
HS-mode
48 MHz
3.2 Mbps
0x0
0x0/0x0
0x07
0x08
0x03
0x01
Fast
60 MHz
400 kbps
0x1
0x2/0x2
0x11
0x28
0x1F
0x08
Fast+
60 MHz
1 Mbps
0x1
0x2/0x2
0x07
0x0F
0x0B
0x01
HS-mode
60 MHz
3.33 Mbps
0x1
0x0/0x0
0x04
0x04
0x02
0x01
Chapter 46 Low Power Inter-Integrated Circuit (LPI2C)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
1459
Содержание MWCT101 S Series
Страница 2: ...MWCT101xS Series Reference Manual Rev 3 07 2019 2 NXP Semiconductors...
Страница 42: ...MWCT101xS Series Reference Manual Rev 3 07 2019 42 NXP Semiconductors...
Страница 50: ...Conventions MWCT101xS Series Reference Manual Rev 3 07 2019 50 NXP Semiconductors...
Страница 70: ...Aliased bit band regions MWCT101xS Series Reference Manual Rev 3 07 2019 70 NXP Semiconductors...
Страница 78: ...Pinout diagrams MWCT101xS Series Reference Manual Rev 3 07 2019 78 NXP Semiconductors...
Страница 96: ...WCT101xS safety concept MWCT101xS Series Reference Manual Rev 3 07 2019 96 NXP Semiconductors...
Страница 130: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 130 NXP Semiconductors...
Страница 200: ...Initialization application information MWCT101xS Series Reference Manual Rev 3 07 2019 200 NXP Semiconductors...
Страница 284: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 284 NXP Semiconductors...
Страница 430: ...Functional Description MWCT101xS Series Reference Manual Rev 3 07 2019 430 NXP Semiconductors...
Страница 472: ...Application Information MWCT101xS Series Reference Manual Rev 3 07 2019 472 NXP Semiconductors...
Страница 508: ...Reset memory map and register descriptions MWCT101xS Series Reference Manual Rev 3 07 2019 508 NXP Semiconductors...
Страница 528: ...Module clocks MWCT101xS Series Reference Manual Rev 3 07 2019 528 NXP Semiconductors...
Страница 634: ...SRAM configuration MWCT101xS Series Reference Manual Rev 3 07 2019 634 NXP Semiconductors...
Страница 696: ...Initialization and application information MWCT101xS Series Reference Manual Rev 3 07 2019 696 NXP Semiconductors...
Страница 818: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 818 NXP Semiconductors...
Страница 960: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 960 NXP Semiconductors...
Страница 970: ...Memory Map and Register Definition MWCT101xS Series Reference Manual Rev 3 07 2019 970 NXP Semiconductors...
Страница 992: ...ADC calibration scheme MWCT101xS Series Reference Manual Rev 3 07 2019 992 NXP Semiconductors...
Страница 1118: ...Application information MWCT101xS Series Reference Manual Rev 3 07 2019 1118 NXP Semiconductors...
Страница 1294: ...Initialization Procedure MWCT101xS Series Reference Manual Rev 3 07 2019 1294 NXP Semiconductors...
Страница 1348: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 1348 NXP Semiconductors...
Страница 1366: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 1366 NXP Semiconductors...
Страница 1514: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 1514 NXP Semiconductors...
Страница 1726: ...Debug and security MWCT101xS Series Reference Manual Rev 3 07 2019 1726 NXP Semiconductors...
Страница 1740: ...Initialization application information MWCT101xS Series Reference Manual Rev 3 07 2019 1740 NXP Semiconductors...
Страница 1760: ...MWCT101xS Series Reference Manual Rev 3 07 2019 1760 NXP Semiconductors...