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RL78/G1A 
CHAPTER  30   ELECTRICAL  SPECIFICATIONS  (G:  INDUSTRIAL  APPLICATIONS  T
A
  =  
−40  to  +105°C) 
R01UH0305EJ0200  Rev.2.00 
 
 
925  
Jul 04, 2013 
30.5  Peripheral Functions Characteristics 
 
AC Timing Test Points 
 
V
IH
/V
OH
V
IL
/V
OL
Test points
V
IH
/V
OH
V
IL
/V
OL
 
 
30.5.1  Serial array unit 
 
(1)  During communication at same potential (UART mode) (dedicated baud rate generator output) 
(T
A
 = 
−40 to +105°C, 2.4 V ≤ EV
DD0
 
≤ V
DD
 
≤ 3.6 V, V
SS
 = EV
SS0
 = 0 V) 
Parameter Symbol 
Conditions 
MIN. 
TYP. 
MAX. 
Unit 
 
 
 
f
MCK
/12 bps 
Transfer rate
Note 1
 
 
 
Theoretical value of the 
maximum transfer rate 
f
CLK
 = 32 MHz, f
MCK
 = f
CLK
 
  
2.6
Note 2
 Mbps 
 
Notes 1.  Transfer rate in the SNOOZE mode is 4800 bps. 
 
2.  The following conditions are required for low-voltage interface when EV
DD0
 < V
DD
. 
2.4 V 
≤ EV
DD0
 < 2.7 V : MAX. 1.3 Mbps 
 
Caution  Select the normal input buffer for the RxDq pin and the normal output mode for the TxDq pin by using 
port input mode register g (PIMg) and port output mode register g (POMg). 
 
UART mode connection diagram (during communication at same potential) 
 
RL78 microcontroller
TxDq
RxDq
Rx
Tx
User device
 
 
UART mode bit width (during communication at same potential) (reference) 
 
Baud rate error tolerance
High-/Low-bit width
1/Transfer rate
TxDq
RxDq
 
 
 
Remarks  1.  q: UART number (q = 0 to 2), g: PIM and POM number (g = 0, 1) 
2.  f
MCK
: Serial array unit operation clock frequency  
(Operation clock to be set by the CKSmn bit of serial mode register mn (SMRmn).  m: Unit number,  
n: Channel number (mn = 00 to 03, 10, 11)) 
 
 
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