N2HET1
N2HET2
IOMM mux control signal x
N2HET1[1,3,5,7,9,11] / N2HET2[8,10,12,14,16,18]
N2HET1[1,3,5,7,9,11]
N2HET2[8,10,12,14,16,18]
NHET_LOOP_SYNC
EXT_LOOP_SYNC
EXT_LOOP_SYNC
NHET_LOOP_SYNC
N2HET1
N2HET2
123
TMS570LS0714
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SPNS226E – JUNE 2013 – REVISED NOVEMBER 2016
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Peripheral Information and Electrical Specifications
Copyright © 2013–2016, Texas Instruments Incorporated
Table 7-27. Dynamic Characteristics for the N2HET Input Capture Functionality
PARAMETER
MIN
MAX
UNIT
1
Input signal period, PCNT or WCAP for rising edge to
rising edge
(HRP) (LRP) tc
(VCLK2)
+ 2
2
25
(HRP) (LRP) tc
(VCLK2)
– 2
ns
2
Input signal period, PCNT or WCAP for falling edge to
falling edge
(HRP) (LRP) tc
(VCLK2)
+ 2
2
25
(HRP) (LRP) tc
(VCLK2)
– 2
ns
3
Input signal high phase, PCNT or WCAP for rising edge
to falling edge
2 (HRP) tc
(VCLK2)
+ 2
2
25
(HRP) (LRP) tc
(VCLK2)
– 2
ns
4
Input signal low phase, PCNT or WCAP for falling edge
to rising edge
2 (HRP) tc
(VCLK2)
+ 2
2
25
(HRP) (LRP) tc
(VCLK2)
– 2
ns
7.7.4
N2HET1 to 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). An 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 resynchronization signal from the
master, the slave must synchronize itself again.
Figure 7-17. N2HET1 to N2HET2 Synchronization Hookup
7.7.5
N2HET Checking
7.7.5.1
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 7-18
. The direction of the monitoring is controlled
by the I/O multiplexing control module.
Figure 7-18. N2HET Monitoring
