
• Transmit FIFO requesting to transmit or receive data without a START condition
(sets MSR[FEF]).
• SCL (or SDA if MCFGR1[TIMECFG] is set) is low for (MCFGR2[TIMELOW] *
256) prescaler cycles without a pin transition (sets MSR[PLTF]).
Software must respond to the MSR[PTLF] flag to terminate the existing command either
cleanly (by clearing MCR[MEN]) or abruptly (by setting MCR[SWRST]).
The MCFGR2[BUSIDLE] field can be used to force the I2C bus to be considered idle
when SCL and SDA remain high for (1) prescaler cycles. The I2C bus is
normally considered idle when the LPI2C master is first enabled, but when BUSIDLE is
configured greater than zero then SCL and/or SDA must be high for (1)
prescaler cycles before the I2C bus is first considered idle.
27.3.2.6 Pin Configuration
The LPI2C master defaults to open-drain configuration of the LPI2C_SDA and
LPI2C_SCL pins. Support for true open drain is device specific and requires the pins
where LPI2C pins are muxed to support true open drain. Support for high speed mode is
also device specific and requires the LPI2C_SCL pin to support the current source pull-
up required in the I2C specification.
The LPI2C master also supports the output only push-pull function required for I2C ultra-
fast mode using the LPI2C_SDA and LPI2C_SCL pins. Support for ultra-fast mode also
requires the IGNACK bit to be set.
A push-pull 2 wire configuration is also available to the LPI2C master that may support a
partial high speed mode provided the LPI2C is the only master and all I2C pins on the
bus are at the same voltage. This will configure the LPI2C_SCL pin as push-pull for
every clock except the 9th clock pulse to allow high speed mode compatible slaves to
perform clock stretching. In this mode, the LPI2C_SDA pin is tristated for master-receive
data bits and master-transmit ACK/NACK bits.
The push-pull 4 wire configuration separates the SCL input and output and the SDA input
and output onto separate pins, with SCL/SDA used as the input pins and SCLS/SDAS
used as the output pins with configurable polarity. This simplifies the external
connections when connecting the I2C bus to external level shifters. The LPI2C master
logic and LPI2C slave logic are not able to connect to separate I2C buses when using this
configuration.
Chapter 27 Low Power Inter-Integrated Circuit (LPI2C)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
737
Содержание K32 L2A Series
Страница 2: ...K32 L2A Reference Manual Rev 2 01 2020 2 NXP Semiconductors...
Страница 42: ...K32 L2A Reference Manual Rev 2 01 2020 42 NXP Semiconductors...
Страница 122: ...Flash Memory Clock K32 L2A Reference Manual Rev 2 01 2020 122 NXP Semiconductors...
Страница 146: ...Module operation in low power modes K32 L2A Reference Manual Rev 2 01 2020 146 NXP Semiconductors...
Страница 158: ...Debug and security K32 L2A Reference Manual Rev 2 01 2020 158 NXP Semiconductors...
Страница 174: ...Module Signal Description Tables K32 L2A Reference Manual Rev 2 01 2020 174 NXP Semiconductors...
Страница 246: ...Application information K32 L2A Reference Manual Rev 2 01 2020 246 NXP Semiconductors...
Страница 322: ...Kinetis Bootloader Status Error Codes K32 L2A Reference Manual Rev 2 01 2020 322 NXP Semiconductors...
Страница 344: ...Application initialization information K32 L2A Reference Manual Rev 2 01 2020 344 NXP Semiconductors...
Страница 374: ...CMP Trigger Mode K32 L2A Reference Manual Rev 2 01 2020 374 NXP Semiconductors...
Страница 384: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 384 NXP Semiconductors...
Страница 592: ...Application Information K32 L2A Reference Manual Rev 2 01 2020 592 NXP Semiconductors...
Страница 602: ...Initialization and application information K32 L2A Reference Manual Rev 2 01 2020 602 NXP Semiconductors...
Страница 656: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 656 NXP Semiconductors...
Страница 664: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 664 NXP Semiconductors...
Страница 744: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 744 NXP Semiconductors...
Страница 762: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 762 NXP Semiconductors...
Страница 806: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 806 NXP Semiconductors...
Страница 868: ...Integer square root K32 L2A Reference Manual Rev 2 01 2020 868 NXP Semiconductors...
Страница 976: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 976 NXP Semiconductors...
Страница 1012: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1012 NXP Semiconductors...
Страница 1094: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1094 NXP Semiconductors...
Страница 1132: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1132 NXP Semiconductors...
Страница 1182: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1182 NXP Semiconductors...
Страница 1290: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1290 NXP Semiconductors...
Страница 1344: ...USB Voltage Regulator Module Signal Descriptions K32 L2A Reference Manual Rev 2 01 2020 1344 NXP Semiconductors...
Страница 1356: ...Initialization Application Information K32 L2A Reference Manual Rev 2 01 2020 1356 NXP Semiconductors...