Datasheet

RL78/L12
CHAPTER 31 ELECTRICAL SPECIFICATIONS (G: TA = -40 to +105°C)
R01UH0330EJ0200 Rev.2.00 933
Dec 13, 2013
31.5 Peripheral Functions Characteristics
AC Timing Test Points
V IH /V OH
V IL /V OL
V IH /V OH
V IL /V OL
Test points
31.5.1 Serial array unit
(1) During communication at same potential (UART mode)
(T
A = −40 to +105°C, 2.4 V ≤ EVDD = VDD ≤ 5.5 V, VSS = EVSS = 0 V)
Parameter Symbol Conditions HS (high-speed main) Mode Unit
MIN. MAX.
Transfer rate
Note 1
fMCK/12 bps
Theoretical value of the
maximum transfer rate
f
MCK = fCLK
Note 2
2.0 Mbps
Notes 1. Transfer rate in the SNOOZE mode is 4800 bps only.
2. The maximum operating frequencies of the CPU/peripheral hardware clock (f
CLK) are:
HS (high-speed main) mode: 24 MHz (2.7 V ≤ V
DD ≤ 5.5 V)
16 MHz (2.4 V ≤ VDD ≤ 5.5 V)
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)
User's device
TxDq
RxDq
Rx
Tx
RL78 microcontroller
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), g: PIM and POM number (g = 1)
2. f
MCK: Serial array unit operation clock frequency
(Operation clock to be set by the serial clock select register m (SPSm) and the CKSmn bit of serial mode
register mn (SMRmn). m: Unit number, n: Channel number (mn = 00, 01))