參數(shù)資料
型號: MC68HC705JB2DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁數(shù): 91/128頁
文件大?。?/td> 2493K
代理商: MC68HC705JB2DW
August 28, 1998
GENERAL RELEASE SPECIFICATION
PROGRAMMABLE TIMER
REV 1.1
9-7
Software can use the output compare register to measure time periods, to
generate timing delays, or to generate a pulse of specic duration or a pulse train
of specic frequency and duty cycle.
Writing to the OCRH before writing to the OCRL inhibits timer compares until the
OCRL is written. Reading or writing to the OCRL after reading the TSR will clear
the output compare ag bit (OCF).
Figure 9-8. Timer Output Compare Block Diagram
To prevent OCF from being set between the time it is read and the time the output
compare registers are updated, use the following procedure:
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
OCRH
R
OCRH7
OCRH6
OCRH5
OCRH4
OCRH3
OCRH2
OCRH1
OCRH0
$0016
W
reset:
UUUUUUUU
OCRL
R
OCRL7
OCRL6
OCRL5
OCRL4
OCRL3
OCRL2
OCRL1
OCRL0
$0017
W
reset:
UUUUUUUU
U = UNAFFECTED BY RESET
Figure 9-9. Output Compare Registers (OCRH, OCRL)
OCIE
OCRH ($0016)
16-BIT COUNTER
÷ 4
INTERNAL
(fOSC ÷ 2)
TIMER CONTROL REG.
TIMER
REQUEST
OUTPUT COMPARE
RESET
CLOCK
INTERRUPT
OCRL ($0017)
OCF
TIMER STATUS REG.
$0012
$0013
INTERNAL
($FFFC)
DATA
R/W
OCRH
R/W
OCRL
BUS
16-BIT COMPARATOR
(OCF)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關代理商/技術參數(shù)
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