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数据手册 > 微控制器,MCU,单片机 > NXP > MC9S12XS128MAL 数据手册PDF > MC9S12XS128MAL 用户编程手册 第 1/8 页
MC9S12XS128MAL
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MC9S12XS128MAL 用户编程手册 - NXP

  • 制造商:
    NXP
  • 分类:
    微控制器,MCU,单片机
  • 封装
    LQFP-112
  • 描述:
    MCU 16Bit HCS12 CISC 128KB Flash 5V 112Pin LQFP Brick
更新时间: 2024-06-19 03:30:23 (UTC+8)

MC9S12XS128MAL 用户编程手册

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© Motorola, Inc., 2004
AN2724
Rev. 0, 4/2004
Using the HCS12X PIT as a
24-bit Elapsed Timer
Application Note
By Stephen Pickering
8/16-bit Systems Group
East Kilbride, Scotland
Introduction
This application note demonstrates how the Programmable Interrupt Timer
(PIT) module on the HCS12X can be used as a 24-bit elapsed timer.
The HCS12X Programmable Interrupt Timer
The Programmable Interrupt Timer is an array of two 8-bit micro timers and four
16-bit timers that can be used to trigger peripheral modules or to raise periodic
interrupts. Notable features of the Programmable Interrupt Timer are as
follows.
Four timers implemented as programmable modulus down-counters
with independent timeout periods
Timeout periods selectable between 1 and 2
24
bus clock cycles. The
timeout equals m*n bus clock cycles, where 1
<= m <= 256 and
1
<= n <= 65536
The timers can be enabled individually
Starting of timer channels can be aligned to each other
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc
.
..
Semiconductor, Inc., 2004. All rights reserved.

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