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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 ≤ EVDD0 ≤ VDD ≤ 3.6 V, VSS = EVSS0 = 0 V)
Parameter Symbol Conditions MIN. TYP. MAX. Unit
fMCK/12 bps Transfer rate
Note 1
Theoretical value of the
maximum transfer rate
f
CLK = 32 MHz, fMCK = fCLK
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 < VDD.
2.4 V ≤ EVDD0 < 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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