R7F100LLL3CFB datasheet(94/148 Pages) RENESAS

94 / 148 page

RL78/L23

2. Electrical Characteristics

R01DS0502EJ0110 Rev.1.10

Page 94 of 145

Oct 31, 2025

6. In UART communications with devices operating at different voltage levels (1.8 V, 2.5 V, 3 V)

Note 1.

The smaller maximum transfer rate derived by using fMCK/6 or the following expression is the valid maximum transfer rate.

Expression for calculating the transfer rate when 4.0 V ≤ VDD ≤ 5.5 V and 2.7 V ≤ Vb ≤ 4.0 V

Note 2.

This rate is calculated as an example when the conditions described in the Conditions column are met. See Note 1 above to

calculate the maximum transfer rate under conditions of the customer.

(Notes and Caution continue in the next page.)

(TA = -40 to +105°C, 1.8 V ≤ VDD ≤ 5.5 V, VSS = EVSS = 0 V)

(2/2)

Item

Symbols

Conditions

(high-speed main)

mode

(low-speed main)

mode

(low-power main)

mode

Unit

Min.

Max.

Min.

Max.

Min.

Max.

Transfer

rate

Transmission

4.0 V ≤ VDD ≤ 5.5 V,

2.7 V ≤ Vb ≤ 4.0 V

Note 1

bps

Theoretical value of the

maximum transfer rate

Cb = 50 pF,

Rb = 1.4 kΩ, Vb = 2.7 V

2.8Note 2

2.8Note 2 Mbps

2.7 V ≤ VDD < 4.0 V,

2.3 V ≤ Vb ≤ 2.7 V

Note 3

bps

Theoretical value of the

maximum transfer rate

Cb = 50 pF,

Rb = 2.7 kΩ, Vb = 2.3 V

1.2Note 4

1.2Note 4 Mbps

1.8 V ≤ VDD < 3.3 V,

1.6 V ≤ Vb ≤ 2.0 V

Notes 5, 6

bps

Theoretical value of the

maximum transfer rate

Cb = 50 pF,

Rb = 5.5 kΩ, Vb = 1.6 V

0.43

Note 7

0.43

Note 7

0.43

Note 7

Mbps

Maximum transfer rate =

[bps]

Baud rate error (theoretical value) =

Transfer rate

× 2

{-Cb

× Rb × In (1 -

)}

× 3

2.2

{-Cb

× Rb × In (1 -

)}

2.2

(

)

× Number of transferred bits

Transfer rate

× 100 [%]

* This value is the theoretical value of the relative difference

between the transmission and reception sides.

R7F100LLL3CFB Datasheet(PDF) 94 Page - Renesas Technology Corp

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