TMS570LS3137 datasheet(128/159 Pages) TI

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NHETx

TMS570LS3137

SPNS162.

– SEPTEMBER 2011

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5.4

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.

5.4.1

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 each pin 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

5.4.2

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).

5.4.3

Input Timing Specifications

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

Figure 5-5. N2HET Input Capture Timings

128

Peripheral Information and Electrical Specifications

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