RA4C1 datasheet(36/97 Pages) RENESAS

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Table 2.27

Clock timing (2 of 2)

Parameter

Symbol

Min

Typ

Max

Unit

Test conditions

MOCO clock oscillation frequency

fMOCO

6.8

9.2

MHz

—

MOCO clock oscillation stabilization time

tMOCO

—

µs

—

HOCO clock oscillation frequency

fHOCO24

23.76

24.24

MHz

—

fHOCO32

31.68

32.32

—

fHOCO40

39.6

40.4

—

fHOCO48

47.52

48.48

—

fHOCO64

63.36

64.64

—

fHOCO80

79.2

80.8

—

HOCO clock oscillation stabilization time*3

tHOCO

—

1.9

—

µs

Figure 2.8

PLL clock frequency

fPLL

—

MHz

—

PLL clock oscillation stabilization time

tPLL

—

µs

Figure 2.9

PLL_RTC clock frequency

fPLLR

—

MHz

—

PLL_RTC clock oscillation stabilization time

tPLLR

—

Figure 2.10

Sub-clock oscillator oscillation frequency*4

fSUB

—

32.77

—

kHz

—

Sub-clock oscillation stabilization time*2

tSUBOSC

—

0.5

—

Figure 2.11

Note 1. Time until the clock can be used after the Main Clock Oscillator stop bit (MOSCCR.MOSTP) is set to 0 (operating) when the

external clock is stable.

Note 2. After changing the setting of the SOSCCR.SOSTP bit to start sub-clock oscillator operation, only start using the sub-clock

oscillator after the sub-clock oscillation stabilization time elapsed. Use the oscillator wait time value recommended by the oscillator

manufacturer.

Note 3. This is the time from release from reset state until the HOCO oscillation frequency (fHOCO) reaches the range for guaranteed

operation.

Note 4. The power supply of sub-clock oscillator is VRTC.

tXH

tXcyc

EXTAL external clock input

VCC × 0.5

tXL

tXr

tXf

Figure 2.6

EXTAL external clock input timing

LOCO clock oscillator output

LOCOCR.LCSTP

tLOCO

Figure 2.7

LOCO clock oscillation start timing

RA4C1 Datasheet

2. Electrical Characteristics

R01DS0457EJ0110 Rev.1.10

Jul 4, 2025

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