MB90822 데이터 시트보기 (PDF) - Fujitsu

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MB90822

16-bit Proprietary Microcontroller

Fujitsu 

MB90820 Series

■ PERIPHERAL RESOURCES

1. Low-power Consumption Control Circuit

The MB90820 series has the following CPU operating mode configured by selection of an operating clock and

clock operation control.

• Clock mode

PLL clock mode : A PLL clock that is a multiple of the oscillation clock (HCLK) frequency is used to operate

the CPU and peripheral functions.

Main clock mode : The main clock, with a frequency one-half that of the oscillation clock (HCLK), is used to

operate the CPU and peripheral functions. In main clock mode, the PLL divide circuit

is inactive.

• CPU intermittent operation mode

CPU intermittent operation mode causes the CPU to operate intermittently, while high-speed clock pulses are

supplied to peripheral functions, reducing power consumption. In CPU intermittent operation mode, clock

pulses are supplied intermittently to the CPU when it is accessing a register, internal memory, a peripheral

function, or an external unit.

• Standby mode

In standby mode, the low power consumption control circuit reduces power consumption by stopping;

• The supply of the clock to CPU (sleep mode)

• CPU and peripheral functions (timebase timer mode)

• The oscillation clock itself (stop mode)

• PLL sleep mode

PLL sleep mode is activated to stop the CPU operating clock when the microcontroller enters PLL clock mode;

other components continue to operate on the PLL clock.

• Main sleep mode

Main sleep mode is activated to stop the CPU operating clock when the microcontroller enters main clock

mode; other components continue to operate on the main clock.

• PLL timebase timer mode

PLL timebase timer mode causes microcontroller operation, with the exception of the oscillation clock, PLL

clock and timebase timer, to stop. All functions other than the timebase timer are deactivated.

• Main timebase timer mode

Main timebase timer mode causes microcontroller operation, with the exception of the oscillation clock, main

clock and the timebase timer, to stop. All functions other than the timebase timer are deactivated.

• Stop mode

Stop mode causes the source oscillation to stop. All functions are deactivated.

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