Renesas RL78 Series User Manual page 865

RL78/G1D
(7) Communication at different potential (1.8 V, 2.5 V) (UART mode)
(T = –40 to +85°C, 2.4 V ≤ V
A
Parameter Symbol
Transfer Reception
rate
Transmission 2.7 V ≤ V
Notes 1. Transfer rate in the SNOOZE mode is 4800 bps only.
2. Use it with V
DD
3. Maximum operating frequency of CPU and peripheral hardware clock (f
HS (high-speed main) mode:
LS (low-speed main) mode:
LV (low-voltage main) mode:
4. The smaller maximum transfer rate derived by using f
transfer rate.
Expression for calculating the transfer rate when 2.7 V ≤ V
Maximum transfer rate = 1/{-Cb × Rb × ln (1 - 2.0/Vb)} × 3 [bps]
Baud rate error (theoretical value) =
(1/transfer rate × 2 - {-Cb × Rb × ln (1 - 2.0/Vb)} / (1/transfer rate) × number of transferred bits)
* This value is the theoretical value of the relative difference between the transmission and reception sides.
5. This value as an example is calculated when the conditions described in the "Conditions" column are met.
Refer to Note 4 above to calculate the maximum transfer rate under conditions of the customer.
6. The smaller maximum transfer rate derived by using f
transfer rate.
Expression for calculating the transfer rate when 1.8V ≤ V
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
= V = AV
DD DD_RF DD_RF
Conditions
2.7 V ≤ V ≤ 3.6 V, 2.3 V ≤ V
DD
Theoretical value of the maximum
transfer rate
Note 3
f = f
MCK CLK
2.4 V ≤ V ≤ 3.3 V, 1.6 V ≤ V
DD
Theoretical value of the maximum
transfer rate
Note 3
f = f
MCK CLK
1.8 V ≤ V < 3.3 V, 1.6 V ≤ V
DD
Theoretical value of the maximum
transfer rate
Note 3
f = f
MCK CLK
≤ 3.6 V, 2.3 V ≤ V
DD
Theoretical value of the maximum
transfer rate
C = 50 pF, R
b b
2.4 V ≤ V < 3.3 V, 1.6 V ≤ V
DD
Theoretical value of the maximum
transfer rate
C = 50 pF, R
b b
1.8 V ≤ V < 3.3 V, 1.6 V ≤ V
DD
Theoretical value of the maximum
transfer rate
C = 50 pF, R
b b
V .
≥
b
32 MHz (2.7 V ≤ V
16 MHz (2.4 V ≤ V
8 MHz (1.8 V ≤ V
4 MHz (1.8 V ≤ V
CHAPTER 30 ELECTRICAL SPECIFICATIONS
≤ 3.6 V, V = V = AV
SS SS_RF
HS (high-speed
main) Mode
≤ 2.7 V f
b MCK
≤ 2.0 V f
b MCK
≤ 2.0 V
b
Note 4
≤ 2.7 V
b
1.2
= 2.7 kΩ, V = 2.3 V
b
Notes 2, 6
≤ 2.0 V
b
= 5.5 kΩ, V = 1.6 V
b
≤ 2.0 V
b
= 5.5 kΩ, V = 1.6 V
b
≤ 3.6 V)
DD
≤ 3.6 V)
DD
≤ 3.6 V)
DD
≤ 3.6 V)
DD
/6 or the following expression is the valid maximum
MCK
≤ 3.6 V and 2.3 V ≤ Vb ≤ 2.7 V
DD
/6 or the following expression is the valid maximum
MCK
< 3.3 V and 1.6 V ≤ Vb ≤ 2.0 V
DD
= 0 V)
SS_RF
LS (low-speed LV (low-voltage
main) Mode
MAX. MAX.
Note 1 Note 1
/6 f /6
MCK
5.3 1.3
Note 1 Note 1
/6 f /6
MCK
2.6 1.3
–
Notes 1, 2
f /6
MCK
–
1.3
Note 4
Note 5
Note 5
1.2
Notes 2, 6
0.43
0.43
–
Notes 2, 6
–
Notes 7
0.43
) is following
CLK
Unit
main) Mode
MAX.
Note 1
f /6 bps
MCK
0.6 Mbps
Note 1
f /6 bps
MCK
0.6 Mbps
Notes 1, 2
f /6 bps
MCK
1.3 Mbps
Note 4 bps
Note 5
1.2 Mbps
Notes 2, 6 bps
0.43 Mbps
Notes 2, 6 bps
Notes 7
0.43 Mbps
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