Fujitsu FR81S ユーザーズマニュアル
CHAPTER 47: ON CHIP DEBUGER (OCD)
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: ON CHIP DEBUGGER : OCD
FUJITSU SEMICONDUCTOR CONFIDENTIAL
27
5.3.2. Standby Mode
Standby mode is shown.
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Even if the watch mode is entered, PLL does not stop oscillating when high-speed UART and phase
modulation UART communication are enabled.
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The main clock does not stop oscillating even if the stop mode is entered. PLL does not stop oscillating
when high-speed UART and phase modulation UART communication are enabled. During sub clock
oscillation, the sub clock does not stop and oscillation continues.
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The following shows the functions that differ in operation when the OCD tool is not connected,
according to the above restrictions:
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CAN operation continues in the watch mode and stop mode when PLL is stopped down
(CSELR:PCEN=0) or high-speed UART and phase modulation UART communication are enabled.
(This operation is performed within the range in which no CPU processing occurs.)
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The real-time clock continues operating even during stop mode.
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The counter operation for the RTC/WDT1 calibration continues in the stop mode.
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The following functions perform the same operations as those when the OCD tool is not connected, with
the above restrictions not placed:
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The main timer and sub timer do not run in the stop mode because they are cleared in that mode.
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The power consumption in the watch mode becomes greater than that when the OCD tool is not
connected because the PLL clock oscillation continues.
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The power consumption in the stop mode becomes greater than that when the OCD tool is not connected
because the PLL clock, main clock, and sub clock oscillation continue.
MB91520 Series
MN705-00010-1v0-E
2038