參數(shù)資料
型號: MC68HC805K3DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 89/119頁
文件大?。?/td> 2870K
代理商: MC68HC805K3DW
MC68HC805K3 — Rev. 1.0
8-Bit Timer
71
General Release Specification — MC68HC805K3
Section 8. 8-Bit Timer
8.1 Contents
The timer for this device is an 8-bit ripple counter. The features include
timer overflow, power-on reset (POR), real time interrupt, and COP
watchdog timer. This timer is powered down in the stop mode to reduce
STOP IDD.
As shown in Figure 8-1, the timer is driven by the timer clock, NTF1,
divided by four (4). NTF1 has the same phase and frequency as the
processor bus clock, PH2, but is not stopped by the wait or halt modes.
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 (TCNTR) 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 or fOP/16, followed by two more stages, with the resulting
clock (fOP/16,384) driving the real time interrupt (RTI) circuit.
The RTI circuit consists of three divider stages with a one-of-four
selector. The output of the RTI circuit is further divided by eight to drive
the optional COP watchdog timer circuit, which can be enabled by a
mask option register bit. The RTI rate selector bits, and the RTI and TOF
enable bits and flags are located in the timer control and status register
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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