TMS570LS3137 datasheet(128/173 Pages) TI1

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N2HETx

TMS570LS3137

SPNS162C – APRIL 2012 – REVISED APRIL 2015

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7.4

Enhanced High-End Timer (N2HET)

The N2HET is an advanced intelligent timer that provides sophisticated timing functions for real-time

applications. The timer is software-controlled, using a reduced instruction set, with a specialized timer

micromachine and an attached I/O port. The N2HET can be used for pulse width modulated outputs,

capture or compare inputs, or general-purpose I/O. It is especially well suited for applications requiring

multiple sensor information and drive actuators with complex and accurate time pulses.

7.4.1

Features

The N2HET module has the following features:

•

Programmable timer for input and output timing functions

•

Reduced instruction set (30 instructions) for dedicated time and angle functions

•

160 words of instruction RAM protected by parity

•

User defined number of 25-bit virtual counters for timer, event counters and angle counters

•

7-bit hardware counters for some pins allow up to 32-bit resolution in conjunction with the 25-bit virtual

counters

•

Up to 32 pins usable for input signal measurements or output signal generation

•

Programmable suppression filter for each input pin with adjustable limiting frequency

•

Low CPU overhead and interrupt load

•

Efficient data transfer to or from the CPU memory with dedicated High-End-Timer Transfer Unit (HTU)

or DMA

•

Diagnostic capabilities with different loopback mechanisms and pin status readback functionality

7.4.2

N2HET RAM Organization

The timer RAM uses 4 RAM banks, where each bank has two port access capability. This means that one

RAM address may be written while another address is read. The RAM words are 96 bits wide, which are

split into three 32-bit fields (program, control, and data).

7.4.3

Input Timing Specifications

The N2HET instructions PCNT and WCAP impose some timing constraints on the input signals.

Figure 7-5. N2HET Input Capture Timings

128

Peripheral Information and Electrical Specifications

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