Datasheet

RL78/G13 3. ELECTRICAL SPECIFICATIONS (G: T
A = -40 to +105°C)
Page 153 of 194R01DS0131EJ0310 Rev.3.10
Nov 15, 2013
5. The smaller maximum transfer rate derived by using f
MCK/12 or the following expression is the valid
maximum transfer rate.
Expression for calculating the transfer rate when 2.4 V ≤ EV
DD0 < 3.3 V and 1.6 V ≤ Vb ≤ 2.0 V
Maximum transfer rate =
1
[bps]
{−Cb × Rb × ln (1 −
1.5
V
b
)} × 3
1
Transfer rate × 2
− {−Cb × Rb × ln (1 −
1.5
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.
6. This value as an example is calculated when the conditions described in the “Conditions” column are
met. Refer to Note 5 above to calculate the maximum transfer rate under conditions of the customer.
Caution Select the TTL input buffer for the RxDq pin and the N-ch open drain output (V
DD tolerance (When
20- to 52-pin products)/EVDD tolerance (When 64- to 100-pin products)) mode for the TxDq pin by
using port input mode register g (PIMg) and port output mode register g (POMg). For V
IH and VIL,
see the DC characteristics with TTL input buffer selected.
UART mode connection diagram (during communication at different potential)
RL78 microcontroller
TxDq
RxDq
Rx
Tx
User device
V b
R b