mc68hc05l25 Freescale Semiconductor, Inc, mc68hc05l25 Datasheet - Page 117

• Manufacturer Part Number: mc68hc05l25
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 13
Event Counter
13.1 Features
Event counter features include:
13.2 Introduction
The event counter consists of a 16-bit counter externally driven from the event counter pin, with input gate
generation and filtering circuitry. Average frequency measurements can be made over user specified
intervals ranging from 4 to 60 ms (with 2-MHz bus clock). Measurements are continuously repeated at a
user specified rate. A maskable and resetable event count complete interrupt and event counter
overflow interrupt are available. Using the overflow interrupt, an effective 18-bit count can be achieved.
See
Freescale Semiconductor
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Table
Asynchronous Input up to 6 MHz
Overflow Interrupt
Event Count Complete Interrupt
Variable Gate Generation
Spike Filter
Effective 18-Bit Resolution
13-1.
EVOE
EVOI
EVOF
8
Figure 13-1. Event Counter Block Diagram
16-BIT COUNTER
INTERNAL HC05 BUS
MC68HC05L25 Data Sheet, Rev. 3.1
EVCE
ECCI
8
SYSTEM
CLOCK
EVIF
1/2
EVIE
14
FILTER
GATE SIGNAL CONTROL
EVC TIMING REGISTER
EVI
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