Datasheet

RL78/L12 CHAPTER 30 ELECTRICAL SPECIFICATIONS (A, G: T
A = -40 to +85°C)
R01UH0330EJ0200 Rev.2.00 881
Dec 13, 2013
(4) Communication at different potential (1.8 V, 2.5 V, 3 V) (UART mode) (2/2)
(TA = −40 to +85°C, 1.8 V ≤ EVDD = VDD ≤ 5.5 V, VSS = EVSS = 0 V)
Parameter Symbol Conditions
HS (high-speed
main) Mode
LS (low-speed
main) Mode
LV (low-voltage
main) Mode
Unit
MIN. MAX. MIN. MAX. MIN. MAX.
Transfer rate Transmission
4.0 V ≤ EVDD ≤ 5.5 V,
2.7 V ≤ V
b ≤ 4.0 V
Note 1 Note 1 Note 1 bps
Theoretical value of the
maximum transfer rate
C
b = 50 pF, R b = 1.4 k Ω ,
V
b = 2.7 V
2.8
Note 2
2.8
Note 2
2.8
Note 2
Mbps
2.7 V ≤ EVDD < 4.0 V,
2.3 V ≤ V
b ≤ 2.7 V
Note 3 Note 3 Note 3 bps
Theoretical value of the
maximum transfer rate
C
b = 50 pF, R b = 2.7 k Ω
V
b = 2.3 V
1.2
Note 4
1.2
Note 4
1.2
Note 4
Mbps
2.4 V ≤ EVDD < 3.3 V,
1.6 V ≤ V
b ≤ 2.0 V
Note 6 Note 6 Note 6 bps
Theoretical value of the
maximum transfer rate
C
b = 50 pF, R b = 5.5 k Ω
V
b = 1.6 V
0.43
Note 7
0.43
Note 7
0.43
Note 7
Mbps
1.8 V ≤ EVDD < 3.3 V,
1.6 V ≤ V
b ≤ 2.0 V
Notes
5, 6
Notes
5, 6
bps
Theoretical value of the
maximum transfer rate
C
b = 50 pF, R b = 5.5 k Ω ,
V
b = 1.6 V
0.43
Note 7
0.43
Note 7
Mbps
Notes 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 ≤ EV
DD ≤ 5.5 V and 2.7 V ≤ Vb ≤ 4.0 V
Maximum transfer rate =
1
[bps]
{−Cb × Rb × ln (1 −
2.2
V
b
)} × 3
1
Transfer rate × 2
− {−Cb × Rb × ln (1 −
2.2
V
b
)}
Baud rate error (theoretical value) = × 100 [%]
(
1
Transfer rate
) × Number of transferred bits
* This value is the theoretical value of the relative difference between the transmission and reception sides.
2. This value as an example is calculated when the conditions described in the “Conditions” column are met.
Refer to Note 1 above to calculate the maximum transfer rate under conditions of the customer.
<R>