Fujitsu FR81S Manuale Utente
CHAPTER 21: 32-BIT FREE-RUN TIMER
2. Features
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 32-BIT FREE-RUN TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
5
2.1. Functions of the 32-bit free-run timer
The functions of the 32-bit free-run timer is shown.
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Format : 32-bit up counter
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Number of units : 3
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Clock source : One of 9 internal clocks (peripheral clock (PCLK)/1, /2, /4, /8, /16, /32, /64, /128, /256) or
one of two external clocks (FRCK)
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Count clear factors :
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Software
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Reset
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Compare match (count value of the free-run timer matches the compare clear register)
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Operation start/stop: The operation can be started and stopped by software.
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Interrupt : Compare clear interrupt
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Count value : Read/write enabled (writing is only enabled while counting is inactive)
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The 32-bit free-run timer consists of a 32-bit up counter, control register, 32-bit compare clear register,
and prescaler.
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A compare clear interrupt will be generated when a compare clear register matches the 32-bit free-run
timer upon comparison of the two.
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If there is a compare match with reset, software clear or compare clear register, the counter value will be
reset to "0000_0000
H
".
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It is used as the reference count for 32-bit output compare and 32-bit input capture.
MB91520 Series
MN705-00010-1v0-E
800