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PINMMR179[8]=1 and

PINMMR179[9]=0

N2HET1

GIO

PIN_nDISABLE

PINMMR85[0]=1 and PINMMR85[1]=0

N2HET2[01]/N2HET1_NDIS

GIOA[5]/EXTCLKIN/ePWM1A

ETMTRACECLKIN/EXTCLKIN2/GIOA[5]

Control of Special Multiplexed Options

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SPNU563A–March 2018

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I/O Multiplexing and Control Module (IOMM)

6.5.6 Control for Generating Interrupt Upon External Fault Indication to N2HETx

The N2HET module on this microcontroller allows the application to selectively disable any PWM output

from the N2HET module whenever a fault condition is indicated to the N2HET. This fault condition is input

to the N2HET module via the PIN_nDISABLE input signal. It is important for the CPU to be notified with an

interrupt whenever this fault condition is indicated to the N2HET module.

The PIN_nDISABLE signal for the N2HET1 module can come from two different paths at either the

GIOA[5] terminals or the N2HET2[01] terminal. By default with PINMMR179[8]=1 and PINMMR179[9]=0

the GIOA[5] / EXTCLKIN / ePWM1A terminal is selected as the input for signaling the fault condition.

Setting PINMMR179[8]=0 and PINMMR179[9]=1 will select the terminal N2HET2[01] / N2HET1_NDIS for

signaling the fault condition.

Note that there are two terminals from which to choose the GIOA[5] signal since GIOA[5] is available in

two different terminals. By default with PINMMR85[0]=1 and PINMMR85[1]=0 the terminal shared by

GIOA[5] / EXTCLKIN / ePWM1A is selected. Setting PINMMR85[0]=0 and PINMMR85[1]=1 will select the

terminal shared by ETMTRACECLKIN / EXTCLKIN2 / GIOA[5]. When GIOA[5] is chosen to signal the

fault condition it can also be an interrupt to the CPU if the application enables the interrupt generation

whenever the GIOA[5] terminal is driven low. Figure 6-5 illustrates the multiplexing scheme.

NOTE: The default settings will choose GIOA[5] / EXTCLKIN / ePWM1A terminal for signaling the

fault condition to the N2HET1 and this will be compatible to other TMS570LSxx family of

microcontrollers which have this available feature.

Figure 6-5. GIOA[5] and N2HET1_NDIS Input Multiplexing Scheme

Texas Instruments TMS570LC4357 User Manual

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