TPS767D301 datasheet(21/158 Pages) TI

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SM320F28335-HT

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SPRS682 – DECEMBER 2010

Table 2-3. Signal Descriptions (continued)

NAME

DESCRIPTION (1)

Trip Zone input 3/External Hold Request. XHOLD, when active (low), requests the external interface (XINTF) to

release the external bus and place all buses and strobes into a high-impedance state. To prevent this from

happening when TZ3 signal goes active, disable this function by writing XINTCNF2[HOLD] = 1. If this is not done, the

TZ3/XHOLD

XINTF bus will go into high impedance anytime TZ3 goes low. On the ePWM side, TZn signals are ignored by

default, unless they are enabled by the code. The XINTF will release the bus when any current access is complete

and there are no pending accesses on the XINTF. (I)

SCITXDB

SCI-B Transmit (I)

MCLKXB

McBSP-B transmit clock (I/O)

GPIO15

General purpose input/output 15 (I/O/Z)

Trip Zone input 4/External Hold Acknowledge. The pin function for this option is based on the direction chosen in the

GPADIR register. If the pin is configured as an input, then TZ4 function is chosen. If the pin is configured as an

TZ4/XHOLDA

output, then XHOLDA function is chosen. XHOLDA is driven active (low) when the XINTF has granted an XHOLD

request. All XINTF buses and strobe signals will be in a high-impedance state. XHOLDA is released when the

XHOLD signal is released. External devices should only drive the external bus when XHOLDA is active (low). (I/0)

SCIRXDB

SCI-B receive (I)

MFSXB

McBSP-B transmit frame synch (I/O)

GPIO16

General purpose input/output 16 (I/O/Z)

SPISIMOA

SPI slave in, master out (I/O)

CANTXB

Enhanced CAN-B transmit (O)

TZ5

Trip Zone input 5 (I)

GPIO17

General purpose input/output 17 (I/O/Z)

SPISOMIA

SPI-A slave out, master in (I/O)

CANRXB

Enhanced CAN-B receive (I)

TZ6

Trip zone input 6 (I)

GPIO18

General purpose input/output 18 (I/O/Z)

SPICLKA

SPI-A clock input/output (I/O)

SCITXDB

SCI-B transmit (O)

CANRXA

Enhanced CAN-A receive (I)

GPIO19

General purpose input/output 19 (I/O/Z)

SPISTEA

SPI-A slave transmit enable input/output (I/O)

SCIRXDB

SCI-B receive (I)

CANTXA

Enhanced CAN-A transmit (O)

GPIO20

General purpose input/output 20 (I/O/Z)

EQEP1A

Enhanced QEP1 input A (I)

MDXA

McBSP-A transmit serial data (O)

CANTXB

Enhanced CAN-B transmit (O)

GPIO21

General purpose input/output 21 (I/O/Z)

EQEP1B

Enhanced QEP1 input B (I)

MDRA

McBSP-A receive serial data (I)

CANRXB

Enhanced CAN-B receive (I)

GPIO22

General purpose input/output 22 (I/O/Z)

EQEP1S

Enhanced QEP1 strobe (I/O)

MCLKXA

McBSP-A transmit clock (I/O)

SCITXDB

SCI-B transmit (O)

GPIO23

General purpose input/output 23 (I/O/Z)

EQEP1I

Enhanced QEP1 index (I/O)

MFSXA

McBSP-A transmit frame synch (I/O)

SCIRXDB

SCI-B receive (I)

GPIO24

General purpose input/output 24 (I/O/Z)

ECAP1

Enhanced capture 1 (I/O)

EQEP2A

Enhanced QEP2 input A (I)

MDXB

McBSP-B transmit serial data (O)

GPIO25

General purpose input/output 25 (I/O/Z)

ECAP2

Enhanced capture 2 (I/O)

EQEP2B

Enhanced QEP2 input B (I)

MDRB

McBSP-B receive serial data (I)

GPIO26

General purpose input/output 26 (I/O/Z)

ECAP3

Enhanced capture 3 (I/O)

EQEP2I

Enhanced QEP2 index (I/O)

MCLKXB

McBSP-B transmit clock (I/O)

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