U19858EJ1V0PM00_15 Datasheet, PDF (14/25 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCONTROLLER

μPD78F8056, 78F8057, 78F8058
9. CLOCK GENERATOR
The clock generator generates the clock to be supplied to the CPU and peripheral hardware. The following three kinds
of system clocks are selectable.
<1> X1 oscillator
This circuit oscillates a clock of fx = 2 to 20 MHz by connecting a resonator to X1 and X2.
<2> Internal high-speed oscillator
This circuit oscillates clocks of fIH = 1, 8 MHz (TYP.). After a reset release, the CPU always starts operating
with this internal high-speed oscillation clock.
<3> 20 MHz internal high-speed oscillator
This circuit oscillates clocks of fIH20 = 20 MHz (TYP.).
<4> Supply from the EXCLK pin
An external main system clock (fEX = 2 to 20 MHz) can also be supplied from the EXCLK pin.
Select <4> Supply from the EXCLK pin case of connects as 6. CONNECTION BETWEEN MCU AND RF RANSCEIVER.
The clock generator is basically the same as the one in 78K0R/KF3-L.
Please refer to user manual of 78K0R/KF3-L (U19459E) for the details.
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Preliminary Product Information U19858EJ1V0PM