參數(shù)資料
型號: MC68HC05F4CDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 71/130頁
文件大?。?/td> 10504K
代理商: MC68HC05F4CDW
MC68HC05F4
5-1
CORE TIMER
5
CORE TIMER
The MC68HC05F4 has a 15-stage ripple counter called the core timer (CTIMER). Features of this
timer are: timer overow, power-on reset (POR), real time interrupt (RTI) with four selectable
interrupt rates and a computer operating properly (COP) watchdog timer.
Figure 5-1 Core timer block diagram
CTOF
RTIF
CTOFE
RTIE
RTOF RRTIF
RT1
RT0
COP watchdog
timer
(
÷ 8 )
To
reset
logic
Overow
detect
circuit
(
÷ 4 )
To interrupt logic
Interrupt circuit
RTI select circuit
$09 CTCR
(Core timer counter)
$08 CTCSR
(Core timer control and status)
COP
clear
Internal processor clock
7-bit counter
fOP
fOP / 2
2
fOP / 2
10
fOP / 2
14
fOP / 2
17
Internal bus
8
TPG
41
05F4Book Page 1 Tuesday, August 5, 1997 1:10 pm
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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