R5F121BCAFP datasheet(28/85 Pages) RENESAS

28 / 85 page

RL78/G16

2. ELECTRICAL SPECIFICATIONS (TA

= −40 to +85°C)

R01DS0431EJ0130

Rev.1.30

Page 28 of 85

May 19, 2025

2.2

Oscillator Characteristics

2.2.1

X1 and XT1 oscillator characteristics

[TA =

−40 to +85°C, 2.4 V ≤ VDD ≤ 5.5 V, VSS = 0 V]

Item

Resonator

Condition

MIN.

TYP.

MAX.

Unit

X1 clock oscillation frequency (fx)Note 1

Ceramic resonator/

crystal resonator

2.4 V

≤ V

≤ 5.5 V

MHz

XT1 clock oscillation frequency

(fXT)

Note 1

Crystal resonator

32.768

kHz

Note 1.

Indicates only permissible oscillator frequency ranges. Refer to 2.4 AC Characteristics for instruction

execution time. For actual applications, request evaluation by the manufacturer of the oscillator circuit

mounted on a board so you can use appropriate values.

Caution

Since the CPU is started by the high-speed on-chip oscillator clock after release from the reset state,

the user should use the oscillation stabilization time counter status register (OSTC) to check the X1

clock oscillation stabilization time. Specify the values for the oscillation stabilization time in the OSTC

the oscillation stabilization time with the resonator to be used.

Remark

When using the X1 or XT1 oscillator, refer to 5.4 System Clock Oscillator in the RL78/G16 User’s Manual.

2.2.2

On-chip oscillator characteristics

[TA =

−40 to +85°C, 2.4 V ≤ VDD ≤ 5.5 V, VSS = 0 V]

Item

Symbol

Condition

MIN.

TYP.

MAX.

Unit

High-speed on-chip oscillator clock

frequencyNote 1, Note 2

fIH

MHz

High-speed on-chip oscillator clock

frequency accuracy

TA =

−40 to +85°C

−2.0

+2.0

Low-speed on-chip oscillator clock

frequency

fIL

kHz

Low-speed on-chip oscillator clock

frequency accuracy

−15

+15

Note 1.

The high-speed on-chip oscillator frequency is selected by bits 0 to 2 of option byte (00C2H) and bits 0 to 2 of

the HOCODIV register.

Note 2.

The listed values only indicate the characteristics of the oscillators. Refer to 2.4 AC Characteristics for

instruction execution time.

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