F24 datasheet(127/210 Pages) RENESAS

127 / 210 page

RL78/F23, F24

4. ELECTRICAL SPECIFICATIONS (GRADE 4)

R01DS0446EJ0120 Rev.1.20

Page 127 of 207

Dec 31, 2025

(8) Communication at different potential (UART mode) (TXD output buffer: N-ch open-drain, RXD input buffer:

TTL)

(TA = -40 to +125

°C, 4.0 V ≤ EVDD0 = EVDD1 = VDD ≤ 5.5 V, VSS = EVSS0 = EVSS1 = 0 V)

Parameter

Symbol

Conditions

MIN.

TYP.

MAX.

Unit

Transfer rate

–

Reception

2.7 V

≤ Vb ≤ EVDD0,

VIH = 2.2 V,

VIL = 0.8 V

fMCK/6

bps

Theoretical value of the

maximum transfer rate Note

(Cb = 30 pF)

4.0

Mbps

Transmission

2.7 V

≤ Vb ≤ EVDD0,

VOH = 2.2 V,

VOL = 0.8 V

Smaller number

of the values

given by fMCK/6

and expression

1 is applicable.

bps

Theoretical value of the

maximum transfer rate Note

(Cb = 30 pF)

Normal slew rate

4.0

Mbps

Note Expression 1: Maximum transfer rate = 1 / [ {-Cb × Rb × ln (1 - 2.2/Vb)} × 3 ]

UART mode connection diagram (during communication at different potential)

User's device

RL78

microcontroller

TXD0, TXD1

RXD0, RXD1

F24 Datasheet(PDF) 127 Page - Renesas Technology Corp

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