參數(shù)資料
型號: MC68HC05L25PB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝: TQFP-52
文件頁數(shù): 21/152頁
文件大小: 897K
代理商: MC68HC05L25PB
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
117
Chapter 13
Event Counter
13.1 Features
Event counter features include:
Asynchronous Input up to 6 MHz
Overflow Interrupt
Event Count Complete Interrupt
Variable Gate Generation
Spike Filter
Effective 18-Bit Resolution
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.
Figure 13-1. Event Counter Block Diagram
EVIE
ECCI
EVIF
EVI
INTERNAL HC05 BUS
8
16-BIT COUNTER
EVCE
EVC TIMING REGISTER
GATE SIGNAL CONTROL
EVOE
EVOI
EVOF
8
FILTER
1/214
SYSTEM
CLOCK
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