RL78/G1P
CHAPTER 27 ELECTRICAL SPECIFICATIONS
R01UH0895EJ0100 Rev.1.00
733
Nov 29, 2019
27.5 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
27.5.1 Serial array unit
(1) During communication at same potential (UART mode)
(T
A
=
40 to +85
C, 2.7 V
V
DD
3.6 V, V
SS
= 0 V)
Parameter Symbol
Conditions HS
(high-speed
main) Mode
LS (low-speed main)
Mode
Unit
MIN. TYP. MIN. MAX.
Transfer rate
Note 1
2.7
V
≤
V
DD
≤
3.6 V
f
MCK
/6 f
MCK
/6 bps
Theoretical value of the maximum transfer rate
f
MCK
= f
CLK
Note 2
5.3 1.3
Mbps
UART mode connection diagram (during communication at same potential)
RL78 microcontroller
TxDq
RxDq
Rx
Tx
User's device
UART mode bit width (during communication at same potential) (reference)
Baud rate error tolerance
High-/Low-bit width
1/Transfer rate
TxDq
RxDq
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: 32 MHz (2.7 V
≤
V
DD
≤
3.6 V)
LS (low-speed main) mode: 8 MHz (2.7 V
≤
V
DD
≤
3.6 V).
Remarks
1.
q: UART number (q = 0)
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, 01))