參數(shù)資料
型號: MC68HC05E5P
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, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 90/140頁
文件大?。?/td> 847K
代理商: MC68HC05E5P
MC68HC05E5 Rev. 1.0
General Release Specification
MOTOROLA
Timer
53
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05E5
Section 8. Timer
8.1 Contents
8.2 Introduction
The timer for this device is a 15-stage multifunctional ripple counter. The
features include timer overflow, power-on reset (POR), and real-time
interrupt.
As seen in Figure 8-1, the timer is driven by the output of the clock select
circuit (as determined by the value of BCS in the PLLCR) and then a
fixed divide-by-four prescaler. This signal drives an 8-bit ripple counter.
The value of this 8-bit ripple counter can be read by the CPU at any time
by accessing the timer counter register (TCR) at address $09. A timer
overflow function is implemented on the last stage of this counter, giving
a possible interrupt at the rate of fop/1024. Two additional stages
produce the POR function at fop/4064.
This circuit is followed by two more stages, with the resulting clock
(fop/16,384) driving the real-time interrupt circuit. The RTI circuit consists
of three divider stages with a one-of-four selector. The RTI rate selector
bit and the RTI and TOF enable bits and flags are located in the timer
control and status register at location $0008.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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