Fujitsu FR81S ユーザーズマニュアル
CHAPTER 5: CLOCK
2. Features
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CLOCK
FUJITSU SEMICONDUCTOR CONFIDENTIAL
5
2. Features
This section explains features of the clock.
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2 system on-chip oscillators are implemented.
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The main clock (MCLK) is multiplied by on-chip PLL/SSCG.
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Each clock has been forced not to supply by using the timer until it becomes stabilized (oscillation
stabilization wait timer).
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Oscillation stabilization wait end interrupt can be generated.
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Main clock oscillation stabilization wait timer (main timer) and sub clock oscillation stabilization wait
timer (sub timer) can be used as a general-purpose interrupt interval timer after the oscillation stabilization
of each clock for main, and sub takes place.
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The clock for the real time clock can be selected from the main clock (MCLK) and the sub clock (SBCLK).
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Implements a CR oscillation circuit for 100kHz WDT1 clock.
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In a single clock product, the CR oscillation clock can be used as a sub-clock source. Refer to the
"CHAPTAR: CLOCK SUPERVISOR" for the selection method.
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Generates the clock for CAN prescaler. The clock can be selected from PLL clock (PLLCLK) [non spread
spectrum clock] and main clock (MCLK). When PLL stops when PLL clock is selected, on-chip bus clock
(HCLK) is used.
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For the noise decrement, the SSCG clock [spread clock] can be selected as CPU and a clock of the
resource.
MB91520 Series
MN705-00010-1v0-E
166