TMS570LS1114 datasheet(133/169 Pages) TI1

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NHET_LOOP_SYNC

EXT_LOOP_SYNC

NHET_LOOP_SYNC

N2HET1

N2HET2

N2HETx

TMS570LS1114

www.ti.com

SPNS188B – OCTOBER 2012 – REVISED FEBRUARY 2015

7.6.3

Input Timing Specifications

All of the N2HET channels have an enhanced pulse capture circuit. The N2HET instructions PCNT and

WCAP use this circuit to achieve the input timing requirements shown in Figure 7-10 and Table 7-23

below.

Figure 7-10. N2HET Input Capture Timings

Table 7-23. Input Timing Requirements for N2HET Channels with Enhanced Pulse Capture

PARAMETER

MIN

MAX

UNIT

1, 2

Input signal period, PCNT or WCAP

(HRP) (LRP) tc(VCLK2) + 2

225 (HRP) (LRP) tc(VCLK2) - 2

Input signal high phase, PCNT or WCAP

2 (HRP) tc(VCLK2) + 2

225 (HRP) (LRP) tc(VCLK2) - 2

Input signal low phase, PCNT or WCAP

2 (HRP) tc(VCLK2) + 2

225 (HRP) (LRP) tc(VCLK2) - 2

7.6.4

N2HET1-N2HET2 Synchronization

In some applications the N2HET resolutions must be synchronized. Some other applications require a

single time base to be used for all PWM outputs and input timing captures.

The N2HET provides such a synchronization mechanism. The Clk_master/slave (HETGCR.16) configures

the N2HET in master or slave mode (default is slave mode). A N2HET in master mode provides a signal

to synchronize the prescalers of the slave N2HET. The slave N2HET synchronizes its loop resolution to

the loop resolution signal sent by the master. The slave does not require this signal after it receives the

first synchronization signal. However, anytime the slave receives the re-synchronization signal from the

master, the slave must synchronize itself again..

Figure 7-11. N2HET1 – N2HET2 Synchronization Hookup

7.6.5

N2HET Checking

7.6.5.1

Internal Monitoring

To assure correctness of the high-end timer operation and output signals, the two N2HET modules can be

used to monitor each other’s signals as shown in Figure 7-12. The direction of the monitoring is controlled

by the I/O multiplexing control module.

Peripheral Information and Electrical Specifications

133

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